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Security Architecture: What They Share

Both platforms use zero-knowledge encryption—your files are encrypted on your device before upload, and the encryption keys never leave your control. Neither Tresorit nor Proton can read your files, even under a legal order.

Both hold ISO 27001 certification and have completed independent third-party audits (Tresorit: Computest, Ernst & Young; Proton: Securitum, SOC 2 Type II). The underlying security model is equivalent.

One independent benchmark does distinguish them. In 2024, ETH Zurich researchers audited five major E2EE cloud storage providers under adversarial conditions — testing whether the encryption actually holds when facing a malicious server. Tresorit performed best of the five: researchers noted its design was "mostly unaffected" by their attacks, while the other four providers had more severe issues including file injection, metadata manipulation, and in some cases plaintext data access. Proton Drive was not among the five providers tested. Tresorit has also passed a separate 2025 penetration test by an independent auditor, which confirmed the ETH Zurich findings.

The meaningful differences between Tresorit and Proton Drive are in features, pricing, and compliance capabilities — which is what the rest of this guide covers.

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What is the Price Difference Between Tresorit and Proton Drive?

Tresorit Business costs $19 per user per month, while Proton Drive Professional costs $7.99 per user per month—a 2.4x price difference that corresponds to substantively different feature sets.

Proton Drive Business Pricing

For businesses, Proton offers Drive Professional at $7.99 per user per month (billed annually). This plan includes:

• 1TB of storage per user
• Minimum of 2 users required
• 365-day file version history
• Online document editor
• End-to-end encryption
• Compliance with data protection regulations

Proton Workspace Standard costs $12.99 per user per month (billed annually; month-to-month billing runs approximately $14.99/user) and offers better value for most businesses. This plan includes everything in Drive Professional plus:

• Encrypted email
• Calendar
• VPN for secure network access
• Password manager
• 10-year file version history (vs 365-day limit)

Tresorit Business Pricing

Tresorit offers two business tiers:

• Tresorit Business: $19/user/month (billed annually). Includes 2 TB storage per user, minimum 3 users, 15 GB file size limit, advanced admin controls, audit logs, custom branding, data residency options (EU or US), and Microsoft/Google/Okta integrations.
• Tresorit Business Pro: $24/user/month (billed annually). Includes 3 TB storage per user, minimum 5 users, 20 GB file size limit, dynamic watermarks, advanced link analytics, BYOK (Azure), Active Directory, and SIEM integration.

For solopreneurs, Tresorit Professional costs $27.49/month for a single user with 4 TB storage.

Enterprise customers get custom pricing with flexible user counts, storage amounts, 20GB max file size, and dedicated support.

How Tresorit's Shared Quota Affects Storage Planning

Both platforms allocate storage per user—Proton gives each user 1 TB, while Tresorit Business gives each user 2 TB. However, Tresorit enforces a critical storage caveat worth understanding before you buy.

Quick Comparison Table: Specs at a Glance

This table compares the Business (Tresorit) and Drive Professional (Proton) plans as of April 2026.

*Shared folders count against every member's quota (double-dipping). See pricing section for details.

**Lumo AI is available across all Proton paid plans with limited prompts. Proton Scribe (email writing assistant) is a paid add-on at Drive Professional and Workspace Standard tiers; it is included in Workspace Premium ($19.99/user/month).

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Collaboration Features and File Sharing

Both services support secure file sharing, but they differ significantly in how much control you have over permissions.

Tresorit Collaboration

• Secure links with granular control: view-only, download limits, password protection, expiration dates
• Detailed permission management for team members and external partners
• File request feature: Collect files from external parties without requiring them to create an account
• Ideal for legal firms, accounting practices, and businesses regularly exchanging sensitive client documents

Proton Drive Collaboration

• Secure file sharing through email invites or shareable links
• Password protection and expiration dates for shared links
• Revoke access at any time
• Works well for straightforward sharing scenarios
• Less granular permission control than Tresorit

Document Editing and AI Features

Proton has expanded its built-in productivity tools significantly:

• Proton Docs — encrypted document editor with real-time collaboration, maintaining end-to-end encryption throughout
• Proton Sheets (launched December 2025) — encrypted spreadsheet editor, a significant step toward feature parity with Google Workspace
• Lumo — Proton's private AI assistant, available across all paid plans with limited prompts at the Drive Professional and Workspace Standard tiers; Workspace Premium unlocks unlimited prompts and advanced model access
• Proton Scribe — an AI email writing assistant; available as a paid add-on on Drive Professional and Workspace Standard, and included in Workspace Premium ($19.99/user/month)

For teams on the $12.99 Workspace Standard plan, Lumo's encrypted AI access is a useful differentiator—your prompts stay zero-access and are not used to train external models, unlike Microsoft Copilot or Google Gemini. Scribe is available as an additional paid add-on if email drafting assistance is also needed.

Tresorit takes a different approach: rather than building its own editors or AI tools, it integrates with Microsoft 365, including Outlook email encryption and file sharing within Teams channels. If your team is already in the Microsoft ecosystem, this is a practical advantage.

eSign (Tresorit Only)

Tresorit eSign is a native, cryptographically secure document signing feature built directly into the platform. For law firms, healthcare practices, and financial services firms already using Tresorit, this eliminates the need for a separate DocuSign or Adobe Sign subscription. Documents are signed and stored with the same end-to-end encryption as the rest of your files—the signature process itself is verifiable and tamper-evident.

Proton Drive does not currently offer a native eSign feature. Teams needing document signing alongside Proton storage would need a separate third-party tool.

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Compliance and Regulatory Requirements

Both services meet GDPR requirements and offer HIPAA compliance with Business Associate Agreements. Understanding these compliance requirements helps determine which platform best fits your regulatory needs.

HIPAA Compliance

Tresorit signs Business Associate Agreements with customers on Business or Enterprise plans (3+ users). Their end-to-end encryption means even compromised servers can't expose data—satisfying HIPAA's breach notification requirements.

Proton also provides BAAs to business customers. Contact legal@proton.ch with subject "HIPAA BAA" for a signed agreement. ISO 27001 and SOC 2 Type II provide additional compliance assurance.

Key Difference: Data Residency

Tresorit offers data residency options—choose between EU or US data centers. This matters for organizations with specific data sovereignty requirements.

Proton stores all data in Switzerland, benefiting from strong privacy laws but offering less geographic flexibility.

Audit Logs and Administrative Controls

Tresorit provides a more comprehensive admin toolkit, which matters for IT managers responsible for compliance reporting:

• Detailed audit logs showing who accessed, modified, or shared which files and when
• Remote device wipe: Revoke access and wipe Tresorit data from a lost or compromised device without touching the device itself
• Mandatory 2FA enforcement: Admins can require two-factor authentication across the entire organization—users cannot opt out
• IP address restrictions: Limit access to specific IP ranges, useful for organizations that want to enforce office-only or VPN-only access
• Policy-based sharing controls: Prevent users from sharing files outside the organization or disable download permissions globally
• Centralized admin dashboard for users, permissions, and data access

Proton Drive provides:

• Audit logs and access controls to track file access
• Administrative panel for user management and 2FA enforcement
• Covers basic compliance needs but lacks the granular policy controls of Tresorit

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How Do Tresorit and Proton Drive Handle File Recovery?

Both platforms use client-side encryption to isolate cloud files from local ransomware. Proton Workspace Standard retains 10 years of versions, surpassing Tresorit.

If an attacker encrypts your local hard drive, they cannot automatically encrypt the cloud copies on either platform without your specific decryption keys. The critical difference lies in historical restoration.

Proton Drive Professional retains 365 days of version history. Proton Workspace Standard extends this to 10 years—a distinct benefit for organizations with long-term record retention requirements.

Tresorit also maintains version history on all business plans, though the retention window varies by plan and is shorter than Proton Workspace Standard’s 10-year offering. Tresorit’s admin controls allow IT managers to restore previous versions for any user from the admin dashboard, which is useful when a single account is compromised.

Both platforms protect against ransomware at the infrastructure level: thanks to the zero-knowledge architecture described above, a ransomware attack on your local machine cannot encrypt the cloud copies—the attacker would need your decryption keys to do so. This gives both platforms a clear edge over non-zero-knowledge storage like Dropbox or Google Drive.

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Do Tresorit and Proton Drive Support Linux?

Tresorit provides a native GUI application for Linux, whereas Proton Drive relies entirely on web access and a command-line interface.

Tresorit Linux: Native GUI app — full graphical interface, drag-and-drop sync, tray integration. Proton Linux: CLI and web browser only — native GUI app is on the roadmap but not yet released.

Tresorit

• Native apps for Windows, macOS, Linux (full GUI), iOS, Android
• The Linux client is a mature graphical interface—a clear advantage for Linux-heavy development teams
• Reliable sync performance across Windows, macOS, and Linux
• 99.9% uptime SLA

Proton Drive

• Native apps for Windows, macOS, iOS, Android
• Linux: Currently limited to a CLI (Command Line Interface) or web browser access; a native Linux GUI app is on the roadmap but not yet released as of April 2026
• Web interface works well across browsers
• Solid performance, though younger infrastructure

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Mobile Apps

Both services offer iOS and Android apps, but the experience differs in maturity.

Tresorit has the more polished mobile client. Key capabilities:

• Automatic photo and document backup from mobile
• Offline access to synced files
• Mobile document scanning—capture physical documents directly into an encrypted tresor
• Biometric authentication (Face ID / fingerprint) for app access
• Full permission management from mobile (view, share, revoke)

Proton Drive mobile apps cover the essentials reliably:

• File browsing, upload, and sharing from iOS and Android
• Offline access to marked files
• Document scanning via the mobile camera
• Biometric authentication supported
• Proton Docs and Sheets accessible from mobile browser; native in-app editing is more limited than the desktop experience

For teams where field staff regularly scan and upload documents—contracts, patient intake forms, site photos—Tresorit's mobile scanning integration is more mature. Proton's mobile experience is functional and improving, but the desktop web interface remains its stronger environment.

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Integration and Ecosystem

How each platform fits into your existing workflow is worth considering alongside the storage specs.

Tresorit is a focused, standalone cloud storage product. Its Microsoft 365 integration—including Outlook email encryption and Teams file sharing—makes it a natural fit for organizations already using Microsoft tools. For encrypted email outside Microsoft, Tresorit offers an Email Gateway add-on.

Proton Drive is one component of a broader privacy-focused suite. The Proton Business Suite bundles:

• Encrypted email (Proton Mail)
• Calendar
• VPN
• Password manager (Proton Pass)
• Cloud storage and document editing

For businesses looking to consolidate their tools under a single privacy-first provider, the suite offers real value. For those who only need storage, Drive Professional is available on its own.

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When to Choose Tresorit

Tresorit is the stronger choice when your work involves regulated data, complex sharing requirements, or a need for detailed administrative oversight:

Real-World Example

We recently worked with a law firm in Coral Gables handling sensitive business acquisitions. They needed to share documents with multiple parties under strict confidentiality—some partners could only view, others could download but not share further. Tresorit's permission controls let them manage these complex requirements without creating separate document sets for each access level.

Try Tresorit Free for 14 Days

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When to Choose Proton Drive

Proton Drive is the better fit when your priority is cost-effective, privacy-first storage with room to grow into a full suite:

Real-World Example

A marketing agency we consult with in Miami Beach switched to Proton Workspace Standard from Google Workspace. They're a six-person team handling client campaign materials—sensitive but not regulated data. For $77.94 per month ($12.99 per user), they get encrypted email, storage, VPN, and a password manager. The transition took about two weeks, and the cost is comparable to what they paid for Google Workspace.

Try Proton Drive Free

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Storage Migration Considerations

Moving data from Google Drive, Dropbox, or Microsoft OneDrive to encrypted storage requires careful planning.

Tresorit: Mature sync clients handle bulk uploads efficiently. Create a "tresor" (secure folder), point it at existing data, and let it sync. Reliable for moving hundreds of gigabytes.

Proton Drive: Proton offers an "Easy Switch" tool that automates email and calendar migration from Google Workspace or Outlook. Drive migration, however, remains largely manual—drag-and-drop for smaller sets, or folder-by-folder sync for larger ones. Smooth for migrations under 100GB; larger migrations take longer.

Migration Tip

Start with a small test migration. Upload a few folders, test sharing with colleagues, and ensure the workflow matches your needs before moving everything. Both services offer free trials—Tresorit for 14 days, and Proton's free tier (5 GB, vs. Tresorit's 3 GB free) allows an extended evaluation before committing. Both are worth testing with real files before you decide.

For businesses wanting data entirely on-premises, a local NAS solution like Synology offers another encrypted storage alternative that keeps files within your physical control.

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Does Tresorit Use Block-Level Sync?

Tresorit does not support block-level sync. Proton Drive also lacks block-level sync, making both equal on this limitation.

When you edit any file on either platform, the entire file is re-uploaded rather than only the changed portion. For most business use cases—documents, PDFs, spreadsheets—this is a non-issue. The limitation becomes significant for large binary files: if your team edits a 2 GB video project file or a large database, every save triggers a full 2 GB re-upload. For development teams or creative agencies working with large assets, this is a notable operational drawback.

Block-level sync is available in competing platforms like Dropbox and OneDrive, which only upload the changed delta of a file. If your workflow regularly involves editing large files (over 500 MB), factor this limitation into your decision.

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Support and Documentation

Support quality matters most when something goes wrong during a migration or a compliance audit.

Tresorit

• Email support for all plans; phone support for Enterprise customers
• Extensive, regularly updated knowledge base
• Dedicated account management on Enterprise plans

Proton

• Email support for all plans; priority support for Business customers
• Active community forums
• Documentation is growing but less comprehensive than Tresorit's
• No phone support on any current plan

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Frequently Asked Questions

Answers to the questions we hear most often from businesses evaluating these two platforms.

Can either service access my files?

No. Both Tresorit and Proton Drive use zero-knowledge encryption. Your files are encrypted on your device before upload. Neither company has access to your encryption keys, so they cannot decrypt your files even if legally compelled to do so.

What happens if I forget my password?

With zero-knowledge encryption, neither service can reset your password or recover your files if you forget your credentials. You'll lose access to your data. Both services strongly recommend storing your recovery key securely when you create your account.

Do both services work on mobile devices?

Yes. Both offer iOS and Android apps with offline access to synced files. Tresorit's mobile apps are more mature with additional features, while Proton Drive's mobile experience is newer but functional.

Can I share files with people who don't use the service?

Yes. Both services let you create secure, password-protected sharing links. Recipients can view or download files without creating an account. Files remain encrypted during transmission.

Which service is faster for syncing large files?

Both deliver solid performance. Tresorit has been optimized longer and handles large file syncs efficiently. In our SMB deployments — typically law office and medical practice onboarding in the 50–150 GB range — Tresorit's sync client handled initial bulk loads more reliably, with fewer pauses or retries on large folder structures. Proton Drive performed comparably for day-to-day incremental syncing; the gap shows up primarily on first-sync of large datasets. Proton Drive performs well but may be slightly slower on initial large uploads, as its infrastructure is newer.

Are there file size limits?

Tresorit Professional supports files up to 10 GB; Tresorit Business up to 15 GB; Business Pro up to 20 GB. Proton Drive has no file size limit on paid plans as of April 2026.

Can I use either service for website backups?

Yes, both work for encrypted backups. However, dedicated backup solutions might be more efficient for automated website backups. These encrypted storage services work better for active file storage and sharing.

Do both services support two-factor authentication?

Yes. Both Tresorit and Proton Drive support two-factor authentication for additional account security. This is essential for protecting access to your encrypted storage.

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Tresorit vs. Proton Drive: Final Verdict

These are two well-built products solving the same core problem from different angles.

Tresorit is the right choice for organizations where compliance, auditability, and granular access control are non-negotiable. Healthcare practices, law firms, and financial services firms will find the feature set justifies the cost. The $19/user price point is a deliberate trade-off: you're paying for enterprise controls—remote device wipe, mandatory 2FA enforcement, IP restrictions, detailed audit logs—not just storage.

Proton Drive is the right choice for small teams that want strong encryption without enterprise complexity. At $7.99/user, Drive Professional is well-priced for storage-only needs. The $12.99/user Workspace Standard—which adds encrypted email, VPN, and a password manager—offers strong cost efficiency for teams consolidating multiple tools under one provider.

For most small businesses (under 10 people) with standard storage and sharing needs, Proton Drive offers better value. For regulated industries or teams requiring 2 TB per user with detailed audit trails, Tresorit is worth the premium.

Both services offer a way to test before committing. Proton's free tier (5 GB) is sufficient for an initial evaluation. Tresorit's 14-day trial gives you full access to the Business feature set. Upload a representative set of files, share a folder with a colleague, and run through your typical workflow before committing.

Related Resources

• Tresorit Review: Secure Cloud Storage — Six months of hands-on testing: sync speeds, admin console, eSign, and whether the premium is worth it
• Best Secure Cloud Storage for Business — Broader comparison including Egnyte and Sync.com for compliance-focused deployments
• Proton Workspace Review — Complete Proton ecosystem: email, VPN, calendar, and Drive together
• Proton Pass Business Review — Password management for SMBs: CLI, vaults, and HIPAA compliance
• Proton Pass vs Bitwarden — Two open-source, audited password managers compared for business
• Proton Pass vs 1Password — Swiss privacy vs polished UX, $1.99 vs $7.99/user
• NordPass vs Proton Pass — Two European password managers for business teams
• Best Cybersecurity Software for Small Business — Security tools overview
• Security Compliance Guide — Understanding HIPAA, GDPR, and FINRA requirements
• Synology NAS Review — On-premises alternative for teams managing large data volumes
• Cybersecurity Services — Professional support for encrypted storage deployment