FoldersSynchronizer - Version 4.1.1 It's the most popular utility for Macintosh (since 1999!) which synchronizes and backs-up files, folders and disks. The user can choose one or more pairs of files/folders/disks and then they will be fast synchronized/backed-up exactly. FS grants several options as Filters, Multiple List, Exclude List, Timers, Log, Preview Items List, Auto-Mount Volumes and AppleScript.