Free File Sync

From EasierSoft: Free File Sync is an easy and reliable bi-directional, side-by-side folder file synchronization tool, it can be used to synchronize all type of files between your desktop PC and laptop, network computers, other storage devices (USB Key, Flash Drive, etc.). It first compare the different of two folders, then copy the new or changed files to another folder, backing-up and/or synchronizing your critical files is as easy as one click, and you can manually specify which files need to be copied or transferred. This is portable program, it can be copied and pasted USB key, and runs on the USB key, no need to install.