FreeFileSync is an Open-Source folder comparison and synchronization tool.
It supports comparison by date or content, filters, file sizes > 4GB, delete-before-copy for large sync operations, and creation of batch files for automated synchronization, optimized for highest performance and usability without restricted or overloaded UI interfaces.

FreeFileSync is a freely distributed program and is licensed under the GNU General Public License v.3.

Developer: ZenJu
Website: http://sourceforge.net/projects/freefilesync/

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Download FreeFileSync (~1.5Mb)