Will Time Machine back up two internal hard drives on the same computer?

Hi,
I'm running a Quicksilver G4 - the last of the dual booters - and I have two hard drives installed. One is an 80Gb carrying the OS, apps, and iMovie projects and photos.
The original 60Gb drive is still in there, and has the old OS9 and all my work on there, and my iTunes library.
I currently back up to a MyBook 500Gb firewire external drive. It's partioned into 3 sections. One for long term storage, not backed up. The other two hard drives are backed up completely in the other two partitions, using Retrospect.
Can I use Time Machine two back up these two drives, and what do I need to do to the partions?
I thought it best to ask first.

Thanks Ewan,
What I'd like to do is to abandon Retrospect and use Time Machine only for both the internal drives. The remaining part of the external drive just used for storage and not backing up, I'd like to leave how it is, I just drag and drop there.
On my partions, I've allowed 80Gb and 60Gb partitions, the same size as the drives, though neither drive is more than half full.
When you say I can change the disk volume for backup, do you mean that I have to give Time machine a seperate instruction and schedule for backup? That wouldn't be a problem.

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