ProSync is a powerful file synchronizer with the ability to monitor file changes on your system for highly efficient updates. Yet it remains very simple to use: choose a pair of folders and click a button to start copying. Its orderly file operations queue also make it a perfect tool for large one-time tasks. Interrupt a long task and resume at another time.
Note: The downloadable demo is version 1.2.1; the version available for purchase on the Mac App Store is version 1.2.4.: