Then that's an issue with Seagate's backup software, NOT the OSes.

Can't you just access the drive directly WITHOUT the Seagate Manager? Did you make a backup archive or did you copy the raw data? Did you encrypt the data?

You can try looking for a 64-bit version at the Seagate forum.
http://forums.seagate.com/t5/FreeAge...-p/29409#M6411