Tresorit vs Sync.com vs Proton Drive: Encrypted Storage | #ransomware | #cybercrime

Google Drive and Dropbox both had a rough stretch of breach headlines in the past year, and that has pushed a steady stream of privacy-conscious users and small businesses toward a category most people had never heard of a few years ago: end-to-end encrypted, zero-knowledge cloud storage. Tresorit, Sync.com, and Proton Drive sit at the center of that category in September 2026, each promising that not even the company hosting your files can read them.

That promise is not marketing fluff in most cases. All three services encrypt files on the device before they ever touch a server, hold encryption keys the company itself cannot access, and route data through jurisdictions chosen specifically to sidestep US surveillance law. But the three companies solve the problem differently, price it differently, and target different buyers. Tresorit leans into European compliance and enterprise file sharing. Sync.com leans into raw storage-per-dollar and ransomware-style version rollback. Proton Drive leans into bundling storage with an entire privacy-first productivity suite.

This comparison breaks down the full specs, current 2026 pricing, encryption architecture, independent audit history, data center jurisdiction, and real-world use cases for all three, plus a step-by-step migration guide for anyone moving off Google Drive or Dropbox. It fits into the broader picture of 2026 cybersecurity threats, where data-at-rest confidentiality has become as important as perimeter defense. Every figure below comes from each vendor’s own pricing pages and 2025-2026 review data, checked against multiple sources and cross-referenced for accuracy as of September 8, 2026.

Tresorit vs Sync.com vs Proton Drive at a Glance

If you only read one section, read this one. Tresorit is the most enterprise-oriented of the three, built around Swiss and EU compliance, SOC 2 Type II audits, and granular sharing controls for regulated industries. It is also the most expensive per gigabyte of the three. Sync.com, headquartered in Canada, undercuts both rivals on raw storage price and leans hard into its 365-day file version history as a ransomware safety net. Proton Drive, from the same Swiss company behind Proton Mail and Proton VPN, is the newest of the three to mature as a standalone product and wins on ecosystem value: pay for one Proton Unlimited plan and you get encrypted email, VPN, password manager, and drive storage bundled together.

None of the three has disclosed a customer data breach in 2025 or 2026. That is a meaningfully different security track record than Dropbox, which confirmed in September 2026 that roughly 5,000 accounts were compromised through a Lenovo ID integration flaw, or Google Drive, which routinely appears in third-party phishing and credential-stuffing incident reports even though Google’s own infrastructure was not directly breached. The difference is architectural: Tresorit, Sync.com, and Proton Drive cannot decrypt your files even if a server is compromised, because they never hold the keys in the first place.

Full Specs Comparison: Tresorit vs Sync.com vs Proton Drive

The table below lines up the core technical and business specs for all three encrypted cloud storage providers as they stood in September 2026.

Two things jump out immediately. First, the 4x storage gap between Sync.com’s Solo Basic tier (2 TB for $8/month) and Proton Unlimited (500 GB for $9.99/month) at nearly the same price point. Second, none of the three publishes an unlimited-storage consumer tier the way some mainstream providers market unlimited plans, though Sync.com’s Teams 10TB business tier comes closest for larger organizations.

Pricing Breakdown: Individual, Family, and Business Plans

Pricing across encrypted cloud storage products is messier than mainstream storage because each vendor bundles different features into similarly named tiers. Here is how the three break down as of September 2026, using annual billing figures from each vendor’s own pricing page since that is what most buyers actually pay.

The practical takeaway: if raw storage-per-dollar is the only thing that matters, Sync.com wins outright at both the individual and Teams level. If a compliance officer is asking about SOC 2 and ISO certifications by name, Tresorit is the only one of the three with those specific paper credentials published. If the buyer already pays for a VPN or password manager separately, folding those into Proton Unlimited at $9.99/month for 500 GB can end up cheaper than paying for encrypted storage and privacy tools as separate line items.

How Each Service Encrypts Your Data

All three products describe themselves as zero-knowledge, but the term covers slightly different implementations. Tresorit’s documentation states plainly that the company “never receives or stores the encryption keys,” which means files stay unreadable to Tresorit at every stage, including if someone gained access to its servers directly. Keys are generated and held client-side using AES-256, and Tresorit’s crypto modules are FIPS 140-2 Level 1 validated, a US government standard for cryptographic module security.

Proton Drive calls its approach “zero-access architecture.” Files are encrypted on the device using AES-256, and Proton layers asymmetric encryption on top for sharing links, so a recipient can decrypt a shared file without Proton itself holding a readable copy at any point. This is the same encryption philosophy Proton uses across Mail, Calendar, and Pass, which is part of why bundling the products together makes technical sense and not just marketing sense.

Sync.com combines AES-256 for file encryption with RSA-2048 for key exchange, and its 2026 documentation emphasizes that both file contents and file metadata (names, folder structure, timestamps) are encrypted client-side, not just the file bodies. That metadata-level encryption is a detail mainstream providers like Google Drive and Dropbox do not match, since both of those can see file names and folder structures even when file contents are protected in transit and at rest.

In practice, the security ceiling is similar across all three: AES-256 is effectively unbreakable by brute force with current computing, so the real differentiator is not the algorithm but the surrounding architecture, audit history, and jurisdiction, which the next two sections cover. Readers building a broader personal encryption habit, including how to encrypt files before they ever reach any cloud provider, will find the same client-side principle at work: the fewer parties that ever hold a readable key, the smaller the attack surface.

Independent Audits and Compliance Certifications

This is the category where Tresorit pulls ahead on paper. In September 2025, Tresorit announced it had passed a NIS2 compliance audit conducted by Ernst & Young, positioning the company for the EU’s tightened Network and Information Systems Directive requirements that are rolling out across European critical infrastructure and digital service providers. Then in December 2025, an independent third-party penetration test concluded that test results found no deviation from Tresorit’s data confidentiality claims, with no critical or high-severity findings in the cryptographic components. Tresorit also maintains annual SOC 2 Type II audits and holds both ISO 27001 (information security management) and ISO 27018 (protection of personal data in the cloud) certifications on a three-year renewal cycle.

Sync.com and Proton Drive both lean more on regulatory compliance than published third-party penetration test reports. Sync.com markets GDPR, HIPAA, and PIPEDA (Canada’s federal privacy law) compliance, which matters most to healthcare, legal, and financial buyers who need those specific frameworks named in a vendor contract. Proton Drive is GDPR compliant by virtue of Swiss and EU data protection law, and Proton’s broader security team has a long public track record from Proton Mail’s encryption work, but neither company has a 2025-2026 penetration test report as prominently published as Tresorit’s.

None of this means Sync.com or Proton Drive are less secure in practice. Architecture and track record matter more than paperwork for actual security outcomes, and both companies have strong reputations built over a decade or more without a major breach. But if your organization’s compliance team specifically needs a named SOC 2 report or ISO certificate number to close a vendor security review, Tresorit currently has the clearest documentation trail of the three.

Data Center Jurisdiction and Why It Matters

Where a company is legally headquartered determines which government can compel it to hand over data, and this is a bigger deal for encrypted cloud storage than for most software categories. Tresorit is headquartered in Switzerland and operates data centers across EU jurisdictions with strong privacy statutes, and offers customers the option to keep data exclusively in European data centers. Proton Drive is also Swiss, and Proton markets Switzerland’s position outside both the EU and the United States as a deliberate advantage: the country is not part of the US CLOUD Act’s reach and has strong constitutional privacy protections baked into Swiss law.

Sync.com is Canadian, storing data exclusively in Canadian data centers under PIPEDA. That is a meaningfully different jurisdiction than either Swiss company, and appeals specifically to customers who want to avoid both US and EU-based legal exposure while still meeting GDPR requirements for European clients.

By contrast, Google Drive and Dropbox are both US-incorporated and subject to US surveillance and data-request law regardless of where their physical servers sit. For a journalist protecting sources, a lawyer holding privileged documents, or a healthcare provider under HIPAA, jurisdiction is not a theoretical concern. It is the difference between a subpoena a company can technically comply with and a subpoena a company cannot comply with because it never held a readable copy of the data to begin with. Jurisdiction failures also carry regulatory teeth of their own: French regulator CNIL’s €500,000 fine against a hospital after a records exposure is a reminder that GDPR enforcement applies regardless of which cloud vendor an organization chose.

Storage Limits, File Size Caps, and Bandwidth

Encrypted cloud storage products historically lagged mainstream providers on raw capacity and file size limits, and that gap has narrowed but not closed by 2026. Tresorit’s business tiers cap individual file sizes at 15 GB (Business) and 20 GB (Business Pro), which is a real constraint for teams moving large video files or database backups, whereas Google Drive and Dropbox both support significantly larger single-file uploads on their business tiers.

Sync.com does not publish a hard file size cap on paid tiers but does enforce bandwidth limits: roughly 5 GB per month on the free tier and approximately 1 TB per month on paid plans. For most individual and small-team use, that bandwidth ceiling is generous, but organizations doing heavy daily backups of large media libraries should model their expected monthly transfer volume against that cap before committing.

Proton Drive does not publish a specific per-file size cap either, and its storage tiers (200 GB to 3 TB depending on plan) are competitive with Sync.com at similar price points once the bundled apps are factored out. None of the three currently matches a Google Workspace Enterprise or Dropbox Advanced unlimited-storage tier, which remains the clearest trade-off for organizations that need both massive scale and end-to-end encryption in one product. Teams that outgrow any of the three on raw capacity sometimes pair encrypted cloud storage with self-hosted network storage for cold archives; a NAS comparison is worth reading before deciding where the capacity ceiling should sit.

Security Track Record: Breaches and Incidents

As of September 2026, none of the three services has a publicly disclosed customer data breach. Tresorit’s own security blog and third-party review coverage report no critical or high-severity findings from its most recent independent pentest. Sync.com’s 2026 reviews consistently describe it as breach-free to date, with the most common criticism being sync speed rather than security. Proton’s broader security reputation, built primarily on Proton Mail’s decade-long track record, extends to Drive without any Drive-specific incident on record in 2025 or 2026.

That clean record stands in contrast to the mainstream storage category during the same period. Dropbox confirmed in September 2026 that approximately 5,000 accounts were compromised through a third-party Lenovo ID authentication integration, a reminder that even companies with strong core security can be exposed through partner integrations. Google Drive has not suffered a comparable direct breach, but it remains a frequent target for phishing campaigns that harvest Google account credentials, since a compromised Google account grants attackers full plaintext access to anything stored in Drive. That plaintext access is exactly what zero-knowledge architecture is designed to prevent: even with a stolen password, an attacker cannot read files without also obtaining the client-side encryption key, which never leaves the user’s device by design.

Ransomware Protection and Version History

Version history has become a de facto ransomware defense for cloud storage, since it lets a victim roll files back to a pre-encryption state rather than paying an attacker. Sync.com markets this most aggressively, offering up to 365 days of version history on its Pro plans and pairing it explicitly with undelete features in its ransomware-resilience messaging. For a small business without a dedicated backup product, a year of rollback history inside the storage service itself is a meaningful safety net.

Proton Drive goes further on raw duration, offering version history up to 10 years on its paid plans, which matters most for compliance-driven retention requirements rather than day-to-day ransomware response, though the effect is the same either way: a corrupted or encrypted file can be restored to any earlier saved state. Tresorit includes version history and restore functionality as well, though the exact retention window varies by plan tier and is less prominently marketed as a standalone ransomware feature than Sync.com’s approach.

It is worth noting that none of these three replace a proper offline or air-gapped backup strategy. Version history protects against accidental overwrites, ransomware encryption, and malicious deletion within the retention window, but it does not protect against an account takeover where an attacker also deletes version history or against catastrophic provider-side data loss. Security teams should treat cloud version history as one layer, not the only layer.

Mobile and Desktop App Experience

Encryption overhead has a real, measurable effect on day-to-day usability, and it shows up most clearly in sync speed and mobile app responsiveness. Sync.com’s 2026 reviews consistently note that its desktop and mobile clients feel slower than Google Drive or Dropbox during large uploads, a direct consequence of encrypting file contents and metadata on the device before anything leaves the machine. For most users moving photos, documents, and the occasional video file, that overhead is barely noticeable. For a video production team pushing multi-gigabyte project files daily, it becomes a real workflow consideration worth testing with the free tier before committing to a paid plan.

Tresorit’s desktop client is built around its “Tresor” folder-vault model, where users create discrete encrypted vaults rather than syncing one flat folder structure the way Dropbox does. That model suits businesses organizing access by project or client but adds a small learning curve for individuals used to a single synced folder. Tresorit’s mobile apps mirror this vault structure and include biometric unlock (Face ID and fingerprint) alongside the standard password, which speeds up daily access without weakening the underlying encryption model.

Proton Drive’s mobile and desktop apps benefit from years of interface refinement carried over from Proton Mail and Proton VPN, and 2026 reviews describe the apps as clean and consistent with the rest of the Proton ecosystem. Because Proton Drive is the newest of the three products to reach full maturity, its desktop sync client arrived later than Tresorit’s or Sync.com’s, but it has closed most of the functional gap by mid-2026, including offline file access and selective sync by folder on both desktop and mobile.

All three support two-factor authentication, and all three offer some form of biometric unlock on mobile. None of the three currently offers a native Linux GUI client with the same polish as their Windows and macOS apps, though Sync.com and Tresorit both support command-line or web-based access on Linux, and Proton Drive’s web app works across any modern browser regardless of operating system.

How They Compare to Google Drive and Dropbox

The most important architectural difference between this category and mainstream cloud storage is who holds the encryption key. Google Drive and Dropbox both encrypt data at rest and in transit, but the companies themselves hold the decryption keys, which is what allows features like in-browser document preview, full-text search across file contents, and AI-powered file summarization. That same key access is also what makes a compromised employee account, a legal subpoena, or a server-side breach a genuine risk to file confidentiality on those platforms.

Tresorit, Sync.com, and Proton Drive trade away some of that convenience for confidentiality. None of the three can offer full-text search inside encrypted file contents the way Google Drive can, because doing so would require holding a readable copy of the data server-side, which defeats the entire zero-knowledge premise. Collaborative real-time document editing is also more limited: Proton Docs exists inside the Proton ecosystem and is improving, but none of the three matches Google Docs’ real-time multi-cursor editing maturity as of September 2026.

The trade-off is straightforward. Choose Google Drive or Dropbox when search, AI features, and deep collaboration matter more than encryption guarantees. Choose Tresorit, Sync.com, or Proton Drive when the confidentiality of the file contents is the primary requirement and some workflow friction is an acceptable cost.

The pattern in that table repeats across nearly every dimension: mainstream providers win on convenience, feature depth, and raw ecosystem maturity, while the encrypted providers win on confidentiality guarantees and jurisdiction. Neither category is objectively better in isolation; the right choice depends entirely on what a given file actually needs to be protected from.

Five Real-World Use Cases

Abstract security claims are easier to evaluate against concrete scenarios. Here are five situations where each service’s specific strengths become the deciding factor.

• An EU law firm handling privileged client documents needs both GDPR compliance and a paper trail of audit certifications to satisfy its own malpractice insurer. Tresorit’s SOC 2 and ISO 27001/27018 certifications, plus its EU-only data residency option, make it the easiest sell to a risk committee that wants named credentials in the vendor file.
• A healthcare clinic in the US and Canada storing patient records needs HIPAA and PIPEDA alignment without paying enterprise pricing. Sync.com’s explicit HIPAA and PIPEDA compliance claims at its Teams pricing tier make it a lower-cost fit than Tresorit’s business tiers for a small practice.
• A freelance investigative journalist protecting source documents from both hackers and legal subpoenas wants a provider outside US jurisdiction with no bundled tracking. Proton Drive’s Swiss jurisdiction, combined with the option to also route communications through Proton Mail and Proton VPN under one privacy-first umbrella, covers more of the threat model in a single subscription.
• A software startup with a distributed team needs secure file sharing for design assets and legal contracts without paying for a full-blown document management platform. Tresorit’s granular sharing controls, including password protection, expiry dates, and access logs on shared links, are purpose-built for that kind of controlled external sharing.
• A small business recovering from a ransomware scare wants insurance against it happening again. Sync.com’s 365-day version history gives the widest rollback window of the three at a comparable price point, letting IT restore pre-encryption file states even if the attack went undetected for months.
• A privacy-conscious individual migrating off Google entirely wants one subscription that replaces Gmail, a VPN, a password manager, and Drive simultaneously. Proton Unlimited at $9.99/month bundles all four, which usually costs less than subscribing to each category separately even before factoring in the value of consolidated billing and a single login, an approach similar in spirit to bundling a dedicated password manager into a broader security stack rather than buying every tool piecemeal.

Use-Case Recommendations: Which Provider Fits Your Profile

Beyond the specific scenarios above, most buyers fall into a handful of broad profiles. Matching profile to provider up front saves the cost and hassle of migrating twice.

• Solo freelancer on a tight budget: Sync.com’s Solo Basic plan at $8/month for 2 TB delivers the most storage per dollar with full zero-knowledge encryption, no bundled extras required.
• Regulated enterprise or EU public-sector vendor: Tresorit’s SOC 2, ISO 27001/27018, and NIS2 audit trail give procurement and legal teams the documentation they typically require before signing off on a new storage vendor.
• Privacy-first household replacing multiple subscriptions: Proton Duo or Family plans consolidate encrypted storage, email, VPN, and password management for two to six people under one bill, which is usually cheaper than paying for each service separately across a household.
• Healthcare or legal practice needing named compliance frameworks: Sync.com’s explicit HIPAA and PIPEDA claims, combined with GDPR alignment, cover the most commonly requested frameworks without enterprise-tier pricing.
• Distributed creative team sharing large assets externally: Tresorit’s password-protected, expiring share links with access logs are purpose-built for controlled external file drops, though teams should budget around its 15-20 GB file size caps on business tiers.
• Developer or technical user who wants encrypted storage plus a broader security stack: Proton Unlimited folds Drive in with Mail, VPN, Pass, and Calendar, reducing the number of separate vendor relationships and billing cycles to manage.

Migration Guide: Moving to Encrypted Cloud Storage

Moving years of files from Google Drive or Dropbox into a zero-knowledge provider takes more planning than a simple drag-and-drop, mainly because encrypted providers cannot recover a lost password the way mainstream providers can reset an account. Follow this sequence to avoid data loss.

1. Audit your current storage. Export a full file list from Google Drive or Dropbox and note total size, largest files, and any files with active external sharing links that will need to be recreated.
2. Choose a plan with enough headroom. Buy at least 20-30% more storage than your current usage to account for version history overhead and future growth, since zero-knowledge providers generally do not offer instant capacity upgrades mid-cycle without a plan change.
3. Set a strong, unique master password and store it in a separate password manager immediately. There is no “forgot password” recovery for the encryption key itself on a true zero-knowledge system; losing it can mean losing the data permanently.
4. Enable two-factor authentication on the new account before uploading anything sensitive.
5. Install the desktop sync client rather than relying solely on browser upload for large migrations, since desktop clients handle interrupted transfers and large file batches more reliably.
6. Migrate in batches by folder rather than all at once, verifying each batch completes and file counts match before starting the next.
7. Use checksum verification on a sample of migrated files to confirm byte-for-byte integrity rather than trusting the upload progress bar alone.
8. Recreate external sharing links inside the new provider’s sharing interface, applying password protection and expiry dates where the old platform did not support them.
9. Keep the old Google Drive or Dropbox account active and unmodified for 30 days as a fallback before deleting anything, in case a migration gap surfaces.
10. Update any automated backup scripts, mobile app configurations, or third-party integrations (accounting software, CRM attachments, etc.) that pointed to the old storage location.
11. Once verification is complete, revoke API access and delete cached credentials tied to the old provider, then downgrade or cancel that subscription.

For technical teams migrating larger datasets, a command-line sync tool with checksum verification support is worth scripting rather than relying purely on GUI uploads. The example below shows a generic checksum comparison pattern that works regardless of which encrypted provider’s desktop client is doing the actual upload.

# Generate checksums before migration
find ./source-folder -type f -exec sha256sum {} \; > pre-migration-checksums.txt

# After the sync client finishes uploading, generate checksums
# on the local mirror/synced folder and diff the two files
find ./synced-folder -type f -exec sha256sum {} \; > post-migration-checksums.txt
diff pre-migration-checksums.txt post-migration-checksums.txt

A clean diff with no output confirms every file transferred without corruption before you touch the delete button on the original copies.

Pros and Cons of Each Encrypted Cloud Storage Provider

Tresorit: Pros and Cons

• Pro: Clearest independent audit trail of the three, with a named 2025 Ernst & Young NIS2 audit and December 2025 pentest results published.
• Pro: SOC 2 Type II, ISO 27001, and ISO 27018 certifications simplify enterprise procurement reviews.
• Pro: Granular sharing controls (password protection, expiry, access logs) built for regulated document workflows.
• Con: The most expensive of the three per gigabyte at every comparable tier.
• Con: File size caps of 15-20 GB on business tiers can be limiting for large media or backup files.
• Con: No bundled productivity suite the way Proton offers.

Sync.com: Pros and Cons

• Pro: Best raw storage-per-dollar of the three at both individual and Teams pricing.
• Pro: 365-day version history on Pro plans is the strongest built-in ransomware rollback window.
• Pro: HIPAA and PIPEDA compliance claims make it accessible for healthcare buyers without enterprise pricing.
• Con: Encryption overhead makes sync noticeably slower than Google Drive or Dropbox in most 2026 reviews.
• Con: Fewer published third-party audit reports compared to Tresorit’s documentation.
• Con: Bandwidth caps on paid plans (roughly 1 TB/month) can constrain heavy daily transfer workloads.

Proton Drive: Pros and Cons

• Pro: Bundled with Proton Mail, VPN, Pass, and Calendar under one subscription, often cheaper than buying each category separately.
• Pro: Longest version history of the three, up to 10 years on paid plans.
• Pro: Swiss jurisdiction outside both EU and US legal reach, backed by a decade of Proton’s public security reputation.
• Con: Smallest standalone storage allocation per dollar at the entry tier (200 GB for $3.99/month).
• Con: Fewer published named audit certifications than Tresorit as of September 2026.
• Con: Best value requires buying into the wider Proton ecosystem rather than storage alone.

Three-Year Cost Comparison at Roughly 2 TB

Monthly pricing headlines can obscure what a plan actually costs over the lifespan most people keep a cloud storage subscription. Normalizing all three providers to roughly 2 TB of usable storage on annual billing gives a clearer three-year picture, since that is the storage tier most individual power users and small teams eventually land on.

Over three years, Sync.com is roughly $144 cheaper than Tresorit’s closest equivalent plan, even though Tresorit’s tier delivers half the storage. That gap narrows considerably once Proton Unlimited’s bundled apps are priced in separately: replacing a standalone VPN subscription (commonly $60-$100/year) and a password manager (commonly $30-$60/year) would push a comparable a-la-carte privacy stack well past Proton’s all-in bundled price, which is the core of Proton Drive’s value argument. Tresorit remains the priciest option in raw storage-per-dollar terms across all three years, a cost that buyers are effectively paying for its audit documentation and enterprise-grade sharing controls rather than for storage capacity itself.

Enterprise and Team Administration Features

For organizations evaluating these three beyond a single-user account, admin tooling matters as much as encryption architecture. Tresorit Business and Business Pro include centralized user management, remote wipe for lost or stolen devices, and detailed access logs across shared Tresors, features aimed squarely at IT teams who need to prove control over sensitive files during an audit. Tresorit also supports single sign-on (SSO) integration on its higher business tiers, letting enterprises tie storage access to their existing identity provider rather than managing separate credentials.

Sync.com’s Teams plans include a centralized admin console, group-based permissions, and the ability to remotely revoke device access, though its SSO support and granular audit logging are less extensive than Tresorit’s enterprise tier. That trade-off tracks with Sync.com’s overall positioning: strong core security and generous storage at a lower price, with fewer of the deep enterprise governance features that larger regulated organizations specifically request.

Proton’s business tiers, marketed under Proton for Business and Drive Professional, extend the same zero-access encryption to team accounts and include admin panels for provisioning and deprovisioning users, along with SSO options on its higher Workspace tiers. Because Proton for Business also covers Mail, VPN, and Pass under the same admin console, IT teams already using Proton for email security get storage administration folded into a tool they are managing anyway, rather than adding an entirely separate vendor relationship and login.

The Verdict: Which Encrypted Cloud Storage Wins in 2026

There is no single winner across every category, and that is the honest conclusion the data supports. If a compliance team needs named audit certifications to close a vendor security review, Tresorit is the strongest choice, backed by its 2025 Ernst & Young NIS2 audit, SOC 2 Type II status, and ISO certifications. If the priority is maximum storage and the strongest built-in ransomware rollback window at the lowest price, Sync.com wins on both storage-per-dollar and its 365-day version history. If the goal is replacing an entire stack of privacy tools (email, VPN, password manager, and storage) with a single bundled subscription, Proton Drive delivers the best total value once the whole Proton Unlimited plan is factored in rather than judging Drive as a standalone product.

For most individual buyers moving off Google Drive or Dropbox purely for privacy reasons without a specific compliance mandate, Proton Drive’s ecosystem bundling makes the strongest financial case. For small businesses in regulated industries, Sync.com’s HIPAA and PIPEDA compliance at Teams pricing hits the best balance of cost and paperwork. For enterprises and regulated European organizations that need to point a risk committee at a specific audit report, Tresorit remains the only one of the three with that level of published third-party validation as of September 2026.

Frequently Asked Questions

Is encrypted cloud storage actually more secure than Google Drive or Dropbox?

For file confidentiality specifically, yes. Zero-knowledge providers like Tresorit, Sync.com, and Proton Drive cannot read your files even if their own servers are breached or if they receive a legal request, because they never hold the decryption key. Google Drive and Dropbox encrypt data too, but the companies hold the keys, which means a server-side breach, insider access, or valid subpoena can expose file contents in a way it cannot on a true zero-knowledge platform.

What happens if I forget my Tresorit, Sync.com, or Proton Drive password?

Because the encryption key is derived from your password and never stored server-side in readable form, none of the three companies can reset your password and restore access to previously encrypted files the way a mainstream provider can. All three offer recovery options such as recovery keys or phrases generated at signup, but users must save those separately; without them, forgotten-password data loss is typically permanent.

Which is cheapest per gigabyte in 2026?

Sync.com’s Solo Basic plan, offering 2 TB for $8/month on annual billing, is the cheapest per gigabyte among the three at the individual tier, roughly a quarter of Proton Unlimited’s per-gigabyte cost at 500 GB for $9.99/month, though Proton’s price includes bundled apps that Sync.com does not offer.

Can these services be used for HIPAA or GDPR compliance?

Sync.com explicitly markets HIPAA and PIPEDA compliance alongside GDPR alignment. Tresorit and Proton Drive are both GDPR compliant under EU and Swiss data protection law, and Tresorit’s SOC 2 and ISO certifications provide additional documentation that regulated buyers often require during vendor security reviews. Organizations should still confirm specific business associate agreement (BAA) availability with each vendor directly before relying on any provider for regulated data.

Do any of these three offer ransomware protection?

All three include file version history that can be used to roll back files encrypted or corrupted by ransomware, functioning as a practical recovery mechanism. Sync.com offers the longest standard window at 365 days on its Pro plans, while Proton Drive extends up to 10 years on paid tiers. None of the three markets itself as a dedicated anti-ransomware security product, and version history should be treated as a recovery layer rather than a replacement for endpoint security.

Can law enforcement or the company itself access my files?

Under a true zero-knowledge architecture, the company cannot decrypt your files even when compelled by a legal request, because it never holds a readable copy of the data or the encryption key. This does not mean the companies are immune from legal process entirely; they can still be required to hand over whatever encrypted, unreadable data they do hold, along with account metadata like signup information or IP logs, depending on jurisdiction.

Do Tresorit, Sync.com, and Proton Drive support team collaboration?

All three offer business and Teams tiers with shared folders, user administration, and access controls. None currently matches Google Workspace’s real-time collaborative document editing depth, though Proton Docs is actively narrowing that gap within the Proton ecosystem. Teams that need heavy real-time co-editing alongside encrypted storage may need to weigh that trade-off against the confidentiality benefits.

Is Proton Drive worth it if I do not need the other Proton apps?

As a standalone storage product, Proton Drive Plus at $3.99/month for 200 GB is competitive but not a clear price leader against Sync.com or Tresorit’s entry tiers. The value proposition strengthens significantly once Mail, VPN, Pass, and Calendar are factored in under the Proton Unlimited plan, so buyers evaluating Drive purely in isolation should compare it against Sync.com’s Solo Basic tier rather than assuming the bundled discount applies to storage alone.

Related Coverage