Could I have two Time Machine backup disks?

I have a MacPro with a second internal HD, that I have running Time Machine.
I just bought an external drive for backup, which I thought I'd also have running Time Machine.  But I see that TM will not really allow one to use two different drives automatically.  Instead you have to reset the TM prerence pane each time you want it to switch from one backup to another.
So, I wonder if I might just be better off with a Carbon Copy clone on the external drive, where I can set up automatic backups easily, and just have TM backup the internal second drive on the MacPro?
Also, another related question: when I change my TM preference pane, to have it backup an external drive, and then change it back to the oringinal, will TM just take up where it left off, or will it start to rewrite the entire HD?  I ask this because I first tried changing the TM preference pane to the external drive, and then changed it back to the original... but it started in on what looked to be a 2 hour backup.
Any tips much appreciated.  I always get a little miffed at how sparse the help instructions seem to be with Time Machine.  I like to set it and forget it... but the problem is I forget how to run it after 8 months!
Thanks!

I wonder if I might just be better off with a Carbon Copy clone on the external drive, where I can set up automatic backups easily, and just have TM backup the internal second drive on the MacPro?
If you want everything to be automatic, that's the way to go.
... when I change my TM preference pane, to have it backup an external drive, and then change it back to the oringinal, will TM just take up where it left off, or will it start to rewrite the entire HD?
It will take up where it left off.
I ask this because I first tried changing the TM preference pane to the external drive, and then changed it back to the original... but it started in on what looked to be a 2 hour backup.
The first backup after you switch will take longer than usual, because more files have changed than is usual.

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    MattLat wrote:
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    John Seal wrote:
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