FreeFileSync Open Source File Synchronization

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Synchronize Files and Folders

Key features
FreeFileSync is a folder comparison and synchronization software that creates and manages backup copies of all your important files. Instead of copying every file every time, FreeFileSync determines the differences between a source and a target folder and transfers only the minimum amount of data needed. FreeFileSync is Open Source software, available for Windows, macOS, and Linux.
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FreeFileSync 14.2
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Latest News

FreeFileSync 14.2 has been released!
FreeFileSync [Business] License Extension
FreeFileSync [Business] Edition
New Sync Concept and Multi-File-Rename
Email notifications
Synchronize files with Google Drive
Parallel file copy and ad-free installer
FreeFileSync Video Tutorials available
FreeFileSync adds Support for FTP and FTPS
 
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User Reviews

Best file sync software I have ever used. I used to run SyncToy 64-bit version, but after running into problems and being unable to fix them (as my file count went up) I decided to try FreeFileSync. To this date, I have not experienced a single problem, not even a hickup. One directory contains over 10 million files, and it runs through with ease.
joqqy
One of the most useful software tools I know — as a computer user you can live without it, but it makes absolutely no sense!
Dr. med. Christoph Schmülling
Best out of all 5 sync programs I've tried, both commercial (Goodsync, AllwaySync) and non-commercial (SyncBack, SyncToy). Don't waste your time trying other "commercial" ones. THIS IS THE BEST.
executerror
Excellent software! I love it!
Link Liu