What it does
CryptSync synchronizes folder pairs while keeping one side encrypted, for use with cloud-sync folders or other backup destinations.
CryptSync's two-folder design is straightforward: work in the original folder while the paired folder holds encrypted copies. The official page describes two-way synchronization and multiple pairs for more than one destination. Keep clear which folder is the readable working copy and which is the encrypted copy intended for the storage provider. Use a distinct encryption password rather than reusing the cloud-account password. Because changes propagate between paired folders, decide how versioned backups will protect against accidental edits or deletion.
Strengths
- Encrypted-copy synchronization with several destination options
Best for
- People adding encrypted copies to an existing backup workflow
Sources
- CryptSync - Stefans Tools (Oct 26, 2026)