Multiple HDDs for 1 MBP for Time Machine?

Alrighty, I couldn't find an answer via search, or through google. And ofcourse, as we al know, if google doesn't have an answer, it doesn't exist! :-P
Here's my situation...
My brother has a mbp c2d 2.4 connected to a Lacie 1TB drive for Time Machine.
I have a mbp c1d 2.0. No time machine running.
I want to get another 1TB drive, connect it to my airport extreme, use that for my time machine; WHILE at the same time, also using it as a time machine for my brother (2 backups for him).
I'm running 10.5.4 with every update done for both systems as well as latest airport updates.
Possible? Or am i seeing groovy colours?

I believe this can work in principle but your brother would have to constantly switch backup disks between two drives and he'd have to do it by hand. I would consider this completely untenable. If he wants double backups for his computer he should use a different backup solution for the second backup. The standard practice is to keep a TM backup and a bootable clone backup made with either [Superduper|http://www.shirt-pocket.com/SuperDuper/SuperDuperDescription.html] or [CCCloner|http://www.bombich.com/software/ccc.html]. that's what i would recommend for him.

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