Use of internal Drives with Time Machine?

I have a Mac Pro 2009 model..
it has the factory-installed drive, of course, which I'm using as a boot volume.
I have also installed 2 internal drives into available drive slots.
1 I use as my active work files drive.
the other, identical drive I'd like to have Time machine back up the contents of the one user-installled internal drive to.
Can I do this?
thank you,
rs

simply because in the discussions of Time Machine I've seen so far, the term "external drive" is used.
I think that's a convention more than a design/requirement.
however, those other drives are not themselves immune from theft, etc.
No, but they can be disconnected, moved offsite, etc.

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