Author: zhnmju123 https://freefilesync.sourceforge.net/
License: Freeware
Requires: Win7/Vista/2K/XP

FreeFileSync is an Open-Source folder comparison and synchronization tool. It is optimized for highest performance and usability without restricted or overloaded UI interfaces.

Features:
• Volume Shadow Copy Service
• Multiple folder pairs
• Batch capability
• Binary comparison
• Handle conflicts and propagate deletions
• Optimized performance
• Cross-Platform

https://www.ryanvm.net/forum/viewtopic.php?t=8719