Independent reviews of cloud storage providers based on end-to-end encryption, zero-knowledge architecture, and actual privacy practices—not affiliate commissions.
| Provider | Jurisdiction | E2E Encrypted | Zero-Knowledge | Free Storage | Price | Verdict | Details |
|---|---|---|---|---|---|---|---|
| Proton Drive | Switzerland | Yes | Yes | 1 GB | Free / €3.99+/mo | Recommended | Visit Site |
| Tresorit | Switzerland | Yes | Yes | None | $12/mo (Personal) | Recommended | Visit Site |
| Cryptomator | Germany (client only) | Yes | Yes | N/A | Free (open source) | Recommended | Visit Site |
| Google Drive | USA | No | No | 15 GB | Free / $2.99+/mo | Avoid | Visit Site |
Zero-knowledge means the provider cannot decrypt your files. E2E encrypted means files are encrypted before leaving your device.
The provider should have no technical ability to read your files. Your encryption keys should never leave your device. Even if the provider is hacked or served a legal order, your files remain private.
Encryption must happen on your device before upload — not on the server after. "Encrypted at rest" often means the provider holds the keys and can still access your data.
Switzerland and Iceland have strong privacy protections and are outside Five/Nine/Fourteen Eyes. US and UK providers face more aggressive legal demands for user data.
Open-source client apps can be audited to verify encryption is implemented correctly. Closed-source clients require trusting the provider's claims.
None of these provide zero-knowledge encryption. The providers can and do access your files — for scanning, advertising, compliance, and legal requests. They are convenient but not private.
"Encrypted at rest" means the provider stores encrypted copies but holds the keys. They can decrypt anytime. Zero-knowledge means they hold no keys and genuinely cannot read your data.
If you delete a file or your account is compromised, cloud-only storage means data loss. Always maintain local backups of important data following the 3-2-1 rule: 3 copies, 2 different media types, 1 offsite.
Starting fresh: Proton Drive for a complete zero-knowledge solution, or Tresorit for business use.
Already using Google Drive or Dropbox: Cryptomator adds zero-knowledge encryption to your existing setup without switching providers.
With zero-knowledge storage, you are responsible for your encryption keys. Losing your password typically means losing your data permanently.
Store your recovery key in your password manager and keep a physical backup in a secure location.
Cloud storage is not a backup. Set up an external drive backup using Time Machine (Mac) or File History (Windows) and keep copies of important files locally.
For sensitive files, consider an encrypted local backup alongside your cloud storage.
Yes — that's exactly what it's designed for. Cryptomator creates an encrypted vault that syncs through Google Drive. Google only ever sees encrypted data. It's a practical way to get zero-knowledge encryption without changing your existing cloud provider.
With zero-knowledge services, losing your password typically means losing your files permanently. Proton provides a recovery key when you sign up — store this securely in your password manager and written down physically. Do not skip this step.
Standard iCloud is not zero-knowledge — Apple holds the keys and has complied with government requests. Apple's Advanced Data Protection enables end-to-end encryption for most iCloud data including photos and Drive. It's worth enabling if you use iCloud, but it's off by default.
Proton Drive has a 1GB free tier with paid plans from €3.99/month. Tresorit starts at around $12/month. Cryptomator is free but requires a separate cloud subscription. For most personal use, Proton Drive's paid plan offers good value alongside the rest of the Proton ecosystem.