FileSync keeps aligned the contents of two folders (source and destination), including all subfolders and files contained. The synchronization of these folders can be both locally and remotely. The application (running in background) is configurable and logs in a text file, with adjustable period, the operations of copy / deletion / overwriting on files / folders. The performance are great: during the files comparison / alignment operations, CPU and RAM usage remains low, even operating on a large number of files. The program is free and not supported. A documentation file is available, within the program installation.
FileSync is available also on www.brothersoft.com