[dnanian]

If you have two backup drives, you'd use them as before, just backing up with SuperDuper! (he should have his own license, of course).

If you want to store two backups on the same drive, one Power PC and one Intel, just partition the drive, making sure to use Apple Partition Map (APM) as the partitioning scheme. Then, direct each machine to its appropriate partition, and you're all set.

Hopefully that's what you meant, Marc!