I think you need to establish (if possible) in what format the data was saved. You could try tar initially, but user the tar tvf option to see what's on the tape rather than extracting it, since there are various issues relating to ralative and absolute pathnames you may need to address.
If it is a tar file with absolute pathnames, you could consider pax to give you the flexibility to restore elsewhere. Perhaps post back with the output of the tar tvf for more detailed information.
I want to be good, is that not enough?