synchronize files and folders
FreeFileSync helps you synchronize files and synchronize folders.
Download FreeFileSync Portable
Version 6.2 for Windows, Multilingual
FreeFileSync Portable works best with the PortableApps.com Platform
Later Versions Broken: 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.
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.