AutoSync lets you synchronize a folder on another drive, (even if it is networked) so that you have all the time a perfect clone of the original folder.
If an item has to be changed in the original folder, it will (depending on the time interval that you set) automatically copied to the destination folder. Your destination folder will be a complete copy of the original folder.
You can also manually initiate a sync via the menu or via the main window.
