When I used hardware quite a while ago, it was pretty difficult to backup tracks as my equipment and my setup changed from time to time. I stored the main lines (e.g. single mixer tracks) and kept records of the song's tempo and the settings, but it way wasn't "total recall". I don't think that there's a good possibility to "backup" if you are mostly using hardware, except with an enormous effort which is often bigger than the time you needed to create your track.