This menu item is only required for the ArchivistaBoxes Titlis, Eiger and Matterhorn, where two ArchivistaBoxes exist. The first box (master) saves the data and sends it to the second box (slave). If one of the two boxes fails, there is still a copy on the second computer.
Analogous to the main computer (master), the mirror computer (slave) also accumulates twice as much data due to the binlog files, because all changes are logged here as well. This tool can also be used to delete the binlog files on the slave computer.