Two drives with the same backup

Is it possible to have Time Machine make the same backup on two drives?
I like to have to backup sets, one stored in some other location for extra security. Ideally, I could swap backup drives every now and then, one being connected to my computer, the other being stored somewhere else.
What do you think?

I think i managed to trick OSX 10.5.1 to accept the second Drive.
here is what i did.
went to Disk utility and asked to verify disk ( the external drive ) of course it went thru the motion and reported that everything is ok.
when i ran TM again, it took the job and did the backup
thing is, i do not know why we cannot repair permissions on external drives !!

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