Am I missing something? To backup and restore, something like this should
work?

mt rewind
dump -0an /var
dump -0an /home

All seems OK. Then I want to restore a file in home..

# restore -i -d -s2
tape read error: Undefined error: 0

/netbsd: st0(ahc0:0:2:0): no data found, requested size: 32768 (decimal), data = 00 00 00 00 00 05 00 00 00 ca 00 00 00 00

st0 at scsibus0 target 2 lun 0: <HP, C5683A, C111> tape removable
ahc0 at pci2 dev 10 function 0: Adaptec 29160 Ultra160 SCSI adapter

How can I test my backups?

Cheers,

Patrick