Using TM to back up an external hard drive to another external hard drive

My question/problem is as follows: I have two external hard drives--one a LaCie 500GB and a new Western Digital 750GB (which I bought because I thought that the LaCie had crashed but, as it turns out it was just the power supply that went out). I have set up Time machine to back up my internal hard drive on my Mac Mini to the Western Digital drive, but I also want to back up the LaCie drive(where I keep my iTunes library) to the Western Digital hard drive. I was recently on the phone with an Apple technical guy who said that it can be done but he told me that he couldn't help me because Apple does not "support" that set up. They only "support" backing up the internal to an external.
Any guidance that someone may be able to provide would be greatly appreciated.
Thanks.

Simon,
Time Machine uses a lot of internal tools within the system files, so it's never a good approach to begin to fool it with duplicates, renamings the exact same names etc such tricks.
Better handle TM the "official" straight way:
Plug both external drives, and tell Time Machine through its normal Preferences, that you are now moving your TM backup routine to the other external drive.
Let it do the first backup then one next, and then only, unplug the first drive so you can send it for repairs.
When you get it back, use TM Preferences again to tell it to backup now back on the first drive again.
That's what I would do personally, or another simple solution:
set Time Machine OFF temporarily while the first drive is being repaired, and use
SuperDuper!
to make daily clones of your Mac on the temporary second drive.

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