synchronize files and folders
FreeFileSync helps you synchronize files and synchronize folders.
Version 6.2 for Windows, Multilingual
8MB download / 36MB installed (Details)
FreeFileSync Portable works best with the PortableApps.com Platform
Later Versions Broken and Paid: All versions of FreeFileSync after 6.2 are broken and can't be run from other apps. This prevents packaging, use of the base portable version with the PA.c Platform, use of the local version with a scheduler, use of the local version with an alternative start menu, etc. Details are in this bug report from March 7, 2014. The current version of FreeFileSync can not be used portably without paying a fee and is no longer fully open source, which may be a violation of the GPL.
FreeFileSync lets you both compare and synchronize files and folders. It supports copying of locked files (Volume Shadow Copy Service), symbolic link support, NTFS permissions syncing, long paths, multiple configurations and jobs, and lots more.