Time Machine Backups with Multiple Target Drives

I am looking at setting up a Time Machine backup solution, for a client, and I was wondering if it was possible to rotate 2 USB drives, and use 1 each week for backups with little or no user intervention.
Even Week = (Drive 1) --> Xserve
Odd Week = (Drive 2) --> Xserve
and cycle this by simply unplugging and plugging as needed.
I am currently without the hardware to test, which is why I post this here, rather than simply experiment.
My current question essentially comes down to, does Time Machine choose target drives based on the S/N of the drive, or simply whatever you have labeled it?

busterv: I used to do this myself for those exact reasons, fire, water damage what ever. I can say that it works well other than having to reset system preferences when you change the drive and the fact that you are exposed for a week or so until you swap the drive.
I say used to because now I use a drive from a company called ioSafe. http://www.iosafe.com. It's fire proof, water proof and even crush poof, now I don't even have to worry about it. I don't work for ioSafe BTW.

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