Proton Drive Review

What Proton Drive Is

Proton Drive stores files securely. Encryption happens on your device, before files hit Proton's servers in Geneva. The company has no keys and can't access contents. The client code is open-source, audited, and available for review. Proton Drive is best thought of as a safe for sensitive files, not a productivity platform.

What It's Good For

Off-device backup is crucial for investigations. Services like iCloud, Google Drive, and Dropbox are US-based. They can be compelled to hand over data via ECPA requests and National Security Letters.

Proton AG is governed by Swiss law. That changes the game. Foreign governments need a formal mutual legal assistance treaty to access data. If you're storing sensitive documents, informant communications, or draft reports, Switzerland's laws offer a much lower risk profile.

Proton Drive's share feature lets you send evidence to legal counsel via encrypted links. You can set a password and expiration date. The recipient downloads the file without creating an account. No unencrypted copy touches Proton's servers. This workflow cannot be replicated with iCloud or Google Drive.

Proton Drive keeps encrypted version history. This lets you recover earlier document states if edits go wrong. For investigators building a file over weeks, this prevents accidental overwrites. You do not need to rely on local snapshots.

The iOS and Android apps give you full access to Drive contents. You can reference source documents or upload photos with the same end-to-end encryption as the desktop client. Your data stays protected.

Getting Started

The free tier offers 1 GB, enough to test the service, but not sufficient for serious work.

For actual investigations, Proton Unlimited costs $7.99/mo, annually. If you're already a ProtonMail or ProtonVPN user, Unlimited covers all Proton tools for the same price, with Drive as an added benefit.

With Unlimited, you get 500 GB plus Mail, VPN, Pass, and Calendar. This is a solid value, including Mail, VPN, Pass, and Calendar.

To get started with Proton, install the desktop sync app and choose a local folder for secure sync, keeping case files out of iCloud or Time Machine synced folders. Then, set up a folder structure that matches your case numbering system. Test sharing a non-sensitive file and confirm password and expiry settings.

The desktop app works, but it's not Dropbox. You might need to refresh manually sometimes, especially on Mac.

Proton Drive Security Features

Pricing

Proton Unlimited costs $7.99/mo for a year's commitment. This hits the sweet spot for practitioners.

Drive on its own is $3.99/mo. That is a tough sell unless you specifically need just that. The Visionary plan supports six users for $23.99/mo. That breaks down to $4/user/mo with 3 TB of storage. It stacks up well against enterprise options.

Limitations

Proton's desktop sync app has some growing pains. It's newer than Dropbox or Google Drive's, and it shows. Large folders sync slower. File events occasionally go missing. CPU usage spikes during encryption. For daily use with big case files, these quirks matter.

The editing tools are basic. Only one person can edit at a time. There is no collaborative editing. If your team needs to work on a document together, Proton's not the tool. Google Docs does this better, with features including real-time collaboration, commenting, and editing.

The free tier is limited. You get 1 GB of storage, which disappears quickly, in hours, not days. It's for testing, not real work. Any serious use requires a paid plan.

Proton Drive Plus costs $3.99/mo. However, if your team needs real controls, such as granular permissions, audit logs, and remote wipe, Tresorit's $10.42/mo per user is more robust. Proton's focus is on individual users, not teams with compliance needs, which include data protection, regulatory requirements, and team management.

Encryption takes time. Uploads and downloads are slower than Google Drive or Dropbox. The delay is a tradeoff. Slow connections or syncing hundreds of files make the wait noticeable.

Alternatives

• Tresorit — E2E encrypted, Swiss-based, with enterprise admin controls (permissions, audit logs, remote wipe) starting at $10.42/mo per user. Choose Tresorit when you're managing a team with compliance requirements and need admin oversight of who accessed what and when; Proton Drive has no equivalent controls.
• Filen — E2E encrypted, open-source, zero-knowledge, with a more generous free tier (10 GB) and cheaper paid plans (~$2.99/mo for 100 GB). Choose Filen if price is the primary constraint and you accept that it is a smaller, less mature service with a smaller audit history than Proton.
• Google Drive — Not E2E encrypted; Google holds decryption keys and complies with US legal requests. Use Google Drive only for non-sensitive materials where collaboration and integrations matter more than privacy.
• iCloud Drive — Not E2E encrypted by default (Advanced Data Protection enables E2E, but it requires opt-in and is US-jurisdiction). Use iCloud Drive for personal device backup; do not use it for case files.
• Dropbox — Not E2E encrypted; US jurisdiction; has complied with law enforcement requests. Faster and more polished desktop sync than Proton Drive, but the wrong tool for sensitive investigation materials.

Verdict

Proton Drive makes sense for investigators already on ProtonMail or ProtonVPN. Proton Unlimited costs $7.99/mo, and Drive is included at no extra cost. The Swiss jurisdiction and zero-knowledge architecture offer a real operational security edge over US cloud providers.

As a solo purchase, Drive costs $3.99/mo. That's a tough sell unless your needs are simple. If team collaboration with admin controls is your priority, you should skip Proton Drive. Tresorit is a better fit, offering team collaboration with admin controls, which includes features such as user management, access controls, and audit logs.

See Also

Best Privacy Tools for Investigators