Can s/o look at this test & see what conclusions can be made?

root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2# fsarchiver -o savefs /mnt/backup/backup-xxxx.fsa /dev/sda2
Statistics for filesystem 0
* files successfully processed:....regfiles=0, directories=1, symlinks=0, hardlinks=0, specials=0
* files with errors:...............regfiles=0, directories=0, symlinks=0, hardlinks=0, specials=0
root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2# dd if=/dev/zero of=/dev/sda2 bs=1024k           

dd: error writing '/dev/sda2': No space left on device
1328+0 records in
1327+0 records out
1391460352 bytes (1.4 GB, 1.3 GiB) copied, 158.857 s, 8.8 MB/s
root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2#
root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2#
root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2# fsarchiver restfs /mnt/backup/backup-xxxx.fsa id=0,dest=/dev/sda2
Statistics for filesystem 0
* files successfully processed:....regfiles=0, directories=1, symlinks=0, hardlinks=0, specials=0
* files with errors:...............regfiles=0, directories=0, symlinks=0, hardlinks=0, specials=0
root@debian:/var/tmp/fsarchiver/fsarchiver-0.8.2#