Free File Sync is an Open Source file synchronization software that’s above everything else super-easy to use. The main interface is separated into a left and right column. Directories can be added to each column. The two main actions offered by Free File Sync are to compare or synchronize the directories and the files residing in them. A click on the Compare button at the top will generate a directory and file listing for every directory that has been added to the application.
For complete how to and latest download version go to FreeFileSync site here.