FreeFileSync Backup vs Sync: How to Keep Recoverable Copies
Quick answer
Synchronization aligns two folder states; a reliable backup also provides recovery from mistaken deletion, corruption and prior versions.
Understand the difference
Mirror can propagate deletions, Update can overwrite changed items, and Two Way can spread unwanted edits across both locations.
Add version history
Enable appropriate versioning or use an independent backup system that retains dated restore points.
Keep a separate copy
Store at least one recoverable copy that is not continuously modified by the synchronization job.
Test recovery
Restore sample documents to an alternate Windows folder and open them. A completed sync log is not enough to prove recoverability.
Before you run the job
Use disposable test folders for the first pass. Keep an independent copy of important files, confirm drive identities, and run Compare before Synchronize. A preview is not a substitute for checking the actual destination afterwards.
Related FreeFileSync Windows guides
Source and review notes
This guide explains a focused Windows workflow. Consult the current FreeFileSync developer manual for precise behavior and edition-specific options. Review each planned file operation and test with non-critical files before relying on a procedure.