Proton Drive

Proton Drive delivers the strongest privacy guarantee among cloud services, using Swiss-based zero-knowledge encryption that prevents even the company from accessing your files. Independent audits confirm that no backdoors exist, and the 200GB plan costs only $4.99 per month — 30% cheaper than the average encrypted provider and 20% less than Sync.com’s comparable pCloud tier. While its privacy foundation is unrivaled due to Switzerland’s data protection laws, it lacks real-time collaborative editing found in #6 Sync.com. A 2025 audit verified encryption integrity with a 100% pass rate, cementing its lead in security-conscious storage.