Backup-Device

  This is the device the backup is written to. It can be any
  tape device with the capability to distinguish between several
  files on the media. It is mandatory to supply the no-rewind
  device here, otherwise this package won't work properly.

  Suitable device names for some OS-es:
  AIX:          /dev/rmt0.1
  Solaris:      /dev/rmt/0bn
  IRIX:         /dev/rmt/tps0d4nr
  HP-UX:        /dev/rmt/0hn
  Linux:        /dev/nst0
  Digital UNIX: /dev/nrmt0h

  If the drive has a media handler attached, a specifier for this
  may follow the device name. The format for this is
   =<drive-count>@<device>#<num-slots>^<num-loadbays> , for example
  =1@/dev/sg0#6^2 . Whitespace before and following the special
  characters = @ and # is allowed for readability. The example
  means: The drive is number 1 in the changer, /dev/sg0 is the
  changer device, that has 6 media slots and 2 loadbays. The
  parts =<drive-count> and ^<num-loadbays> are optional