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Zero-Knowledge Backup & Sync Alternatives
Professional-grade replacements for Zero-Knowledge Backup & Sync software. Verified for features, security, and zero cost.
1
Tools Tested
100%
Free or Open Source
Database Updated Dec 2025
Hand-Picked Comparisons
Save $6/mo (150GB) - $29/mo (5TB)
SpiderOak One Backup
A veteran in the zero-knowledge space, known for its 'No-Knowledge' policy and point-in-time recovery, but criticized for high costs and the lack of 2FA and modern mobile features.
Top Recommended Replacement
Proton DrivePRO CHOICE
100% open-source and Swiss-based; mandatory end-to-end encryption; includes 'Proton Sheets' and 'Docs' for secure collaboration; 2FA support.
Mastering Zero-Knowledge Backup & Sync for Free
Our mission at Best Free Alternatives is to democratize access to high-end digital tools. The software listed above provides professional-grade results without the burden of monthly subscriptions. Whether you are a student, freelancer, or small business owner, these Zero-Knowledge Backup & Sync alternatives are production-ready.