Consider FreeFileSync for a folder-comparison task where you understand the intended direction of changes. Review deletions, edition licensing and your recovery plan before using important folders.
- Folder comparison before synchronization
- Multiple synchronization variants
- Windows, macOS and Linux editions
- Compatibility and results depend on your installation and files
- This coverage is based on documentation, without hands-on performance measurements
Comparison before action
FreeFileSync describes folder comparison and synchronization on Windows, macOS and Linux. It identifies differences so a job can transfer selected changes rather than copying everything again. The useful first question is what the comparison proposes, not how quickly you can press Synchronize. Treat the source and destination names as decisions you must understand.
Different variants have different consequences
The manual distinguishes Two way, Mirror and Update. Mirror can remove target files to reproduce the source, while Two way propagates changes in both directions. Update has different retention rules. A job labelled backup can still carry a deletion action; inspect the actual variant and proposed operations instead of relying on a comforting name.
Learn with disposable copies
Our suggested first comparison uses two temporary folders containing sample files. Add or change one sample, compare again and read the proposed action. Do not start a learning exercise with your only copy of important work. After a small intended sync, inspect the destination and confirm that it contains what you expected.
Match the edition to the use
The project distinguishes private home use from its business licensing. Check the current download and licensing information for your situation rather than assuming the word free applies to every commercial setting. A folder sync is only part of a recovery plan; keeping versions and verifying restoration remain separate tasks.
Go straight to the people who make it.
Project overview and licensing notesSynchronization variantsSource check: 2026-10-02. This is a research review based on official documentation. We have not performed hands-on tests for this review.