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 14.3
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Latest News

FreeFileSync 14.3 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

This has provided reliable backups for a number of years now. I greatly appreciate the visual feedback of the transfer time.
Douglas Hayman
Excellent and portable. It's my favorite solution to sync my devices and make backups. Useful options and intuitive interface. I just have created this account to say thanks to the author.
jslopezg
Thank you for this little tool! It's like SumatraPDF and 7zip, you make every day at the office a useful day!
Moritz Müller
Fast, easy and reliable. A great tool to keep two (or more) folders synchronized (even when changes have been done on both sides since the last synchronization). Excluding certain files or folders from synchronizing is quick and painless.

The application will warn you when too much has changed in the folder contents since the last sync. It supports batch jobs. I personally use this software to backup my personal files onto an external hard drive. It works great through my home network too. Without a doubt, I prefer FreeFileSync over Synctoy and SyncBack. Thank goodness for FreeFileSync!
zenphic