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.
FreeFileSync 10.11
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Latest News

Apr 11, 2019
FreeFileSync 10.11 has been released!
Jan 26, 2019
Synchronize files with Google Drive
Jul 16, 2018
Parallel file copy and ad-free installer
Jun 11, 2017
FreeFileSync Video Tutorials available
May 24, 2017
FreeFileSync adds Support for FTP and FTPS
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User Reviews

This is the most useful tool and about the best free software I've come across in a long while.
John Craig
Great! I've been searching for this kind of program for ages. Bonus would be keeping a backup of mail and browser data (Thunderbird and Firefox to keep it in the open source family) — which is two key items difficult to auto store in customized archives.
Lars-Roger Moe
Thanks you for this great program. I'm using it to back up/sync my laptop/desktop systems via FTP. It's fast to the point and reliable. Once again thanks for all y’all do.
Chris Fox
One of the greatest little housekeeping gadgets around. Great work, thank you!