FreeFileSync Portable

a change has been made to a file, and if so, makes a new copy of that file. This tool gives you several different ways to compare and synchronize all of your folders: - Mirror mode: changes made to a folder are applied, and earlier versions are erased. - Update: copies files from one site to another, respecting the destination folder - Automatic: both folders finish the synchronization process with the same files. FreeFileSync's interface is easy to navigate, and doesn't require you to have any serious computer experience to use it successfully.