Folder synchronization system.
Frigate will help you to synchronize folders.
In this box the source and the destination folders are typed, as well as the extentions of the files you want to compare.
Files can be compared by size or date. In the box of folders comparison you may copy either from the source folder or to the destination folder, view the files and delete them. Viewing the files you will see the marked differences and get the opportunity to edit the files.