Backing up partitions to an external HD, how many images does it make?

I have several partitions on my MBP of which I would like to backup only 2. I know I can control this in the TM setup. However my question is would TM than make one or two sparse images. And if only one how could I get it to make two images.
Or? Any insights or tips about this?
<Edited by Moderator>

Yes you can. But i would suggest to do each one at a time. (Is just for performance, if you try to write from two computers on the same drive at the same time access time will be reduced to less than one half).
Regards,
Elrick

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