Once again on windows Synctoy is what I use to synchronize files in different directories of the same computer or between a computer and external storage devices.
You select a pair of folders that you want to keep in Sync via Synctoy. Then decide the action – should the two folders be clones or only the new files have to be copied ?
SyncToy supports wild-cards in file names (like *.exe or holiday_*.jpg) so you can decide what files are included or excluded during the sync process.
It has a preview feature that lets you see what operations would take place during the run without performing any changes on your computer.
NOTE *If you were to sync files and folders on multiple computers via the internet, consider FolderShare – it can also sync files between a Mac and Windows computer.