Your only solution is to ask a person who has the SNOW + AURA, to do this conversion (from .backup to .mid)
and then, these .mid will load them one by one in AURA whith the M1
NOTE: I always use AURA to save (and repatriate) my BANKS (all in .mid) It's like on the patch sites, they sell them in .mid
In fact I no longer do .backup (of Control virus) only if I want to burn some of the ROMs of my sounds and
for this I charge .mid (build by fAURA) It's possible