This value must be 1 or 0
Cartridge-Handler

This value must be 1 or 0, which means, that you either have a cartridge handling system (i.e. some kind of robot) (1) or not (0). If you don't have a robot, you may nonetheless maintain a set of cartridges, that you will have to manually number. The backup server side will inform you via email or console output, whenever another cartridge has to be inserted into the drive and what number it requires it is.