Extend disk space for Time machine?

Hi,
We can now use 2 disk drives at one location to keep our backup files with Time Machine, thanks to Mountain Lion
Behavior is that both disks will end-up with the same backed-up files.
Is it possible to make it such that the 2 disks complement each other so that a file is back up on one disk only? The outcome being that MacOS sees the 2 disks more as a single but LARGER disk for Time Machine.
The problem I am trying to solve is that my Time-Capsule is starting to be too small for my needs and I would like to extend the storage capacity through a 2nd drive connected directly to my Mac.
Thanks

There are ways you can continue using the TC by just adding a larger external drive to it. See:
My Time Capsule is too small to back-up my Mac(s). Now what?
Note that third-party NAS drives won't work reliably with Time Machine, and neither will a hard drive connected to a wireless router (even an Apple AirPort base station). As long as you've already got the TC, you might as well continue using it in conjunction with a larger drive or hardware RAID setup.

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