i would use a plain
Code:
ifconfig 192.168.0.2
on the one you wqant to back up and
Code:
ifconfig 192.168.0.3
on the other.
just type that in a console. then start the ssh server on the one you want to retrieve files from.

after this you mount a (non NTFS) partiton read write on the computer you want to move the files TO. and then you open conqueror type
Code:
fish://192.168.0.2/
in the adressbar, this opens a conection and alow you to copy the files to the mounted partition.