2 Internal Drives 2 External Drives

I have two internal drives that I would like to backup to two external drives. I love Time Machine and have been using it to backup my primary (startup) internal drive to one of the externals. Now I'd like to backup the other internal to the other external drive, but I don't see a way to do this with Time Machine. Really don't want to go back to using Retrospect. Any ideas?
To clarify:
Drive A, my main internal drive, backs up to Drive B, an external drive, via Time Machine. I want to use Time Machine to backup Drive C, my secondary internal drive, to Drive D, another external drive.

i have been looking for same answers, but i think depending on your usage you CAN do what you need, only you need to look at it with less user control - i.e. specifically being able to back up ONLY A to B and ONLY C to D.
what you can do though is, You can 'join' drive B and D as concatenated under disk utils. so for example if A, B, C, D, are all 250Gb drives, you join B&D to become a single 500Gb concatenated disk set called "BD", and set time machine to use "BD" as it's disk. then select both drives A & C (your two internal drives) to be 'backed up' using time machine.
assuming all goes well, you'll rarely need to call on time machine anyway. If A or C have a problem, you will be able to source the files from the externals using time machine as normal and if neccessary, replace A or C and get back up and running from "BD".
and if B or D fail at any point, they were only the 'back-up' anyway. and same issue is there for all TM users.
so all would be as apple intended, with the possible exception of size / storage / usage issues, IF your external drives are same size or smaller than the internals. Apple suggest 2.5x the storage for TM back-ups, but i think that assumes heavy disk usage, large files and never invoking any (too long ago to back up) problems using TM. but even same size drives offers at least daily back ups and even more assuming you don't run your internal drives at more than 75% capacity?
you could even take a Clone of your Boot drive using something such as CCC or Super Duper once a month or whatever suits (using a separate or smaller/cheaper external) then exclude a whole bunch of big files that don't change often (such as applications folder) from taking up space on "BD" / time machine.
anyway, i think i've talked myself into it, and i'm off to fettle with my huge array of currently wasted disk space!
p.s. if anyone running into this thread knows what happens if Concatenated disks fail. i.e. "can you extract data from one disk if the other dies?" might be handy to know...
Message was edited by: 749mate
when i say 'daily' i mean, if TM is set to back up daily, you may use you entire TM space each day, and only every be abel to go 'back in time' by one day. it's a recent and reliable back up none the less.

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