Can you get Time Machine to backup to a disk image?

I just bought an OWC external enclosure that holds two SATA drives. I upgraded my internal (main) HD to a 1TB drive, and then put my old internal 500 gig (main) HD and my old internal 500 gig (time machine) HD into the external enclosure.
So I'm good, with an external time machine raid array, that I can take off site.
But, I really wanted to encrypt the data, so as if someone broke into my car and stole my offsite backup, not have my data.
I thought about creating a 1TB (well, 930 gigs) encrypted image in disk utility on the external, mounting it, and choosing that for time machine. When I leave, shutdown would dismount the image, then turn off drive, unplug and leave.
But time machine won't allow me to choose the image.
I read about a terminal hack for backing up to unsupported network volumes....I tired that just for kicks, didn't work.
Is there any way to get time machine to allow me to choose a mounted disk image as my backup volume?
Thanks!

Likewise, I'm interested in the same question, but for a different reason: backing up to a NAS. Since a disk image gives you a nice virtual HFS+ partition, it seems a lot less suicidal than trying to shoehorn a Time Machine backup into whatever the NAS's native filesystem happens to be.
In theory it should be possible, since nested disk images (even mixing sparsebundle and plain old DMG) work just fine normally. And having your data in a nice monolithic DMG file would make it easier to copy and move the TM backups -- not to mention, you cap the max size and do encryption easily, as you described.
But it's almost impossible to find this information on the Web -- Googling for this topic results in a bunch of noise about Time Machine's sparsebundle images. I managed to find one similar thread:
http://forums.macosxhints.com/showthread.php?t=91297
But that thread, like this thread, so far doesn't have any solution.
I'm going to try to copy an existing TM backup to the disk image and see if that works. Will post again later, and hope that someone might have a solution someday.
Incidentally, if all you want is encryption, apparently you can get an encrypted TM backup by manually creating the sparsebundle file and turning on encryption. See the parent thread to this comment:
http://www.macosxhints.com/comment.php?mode=view&cid=98733
Anyway, let's hope someone might have a time-machine-inside-a-disk-image solution someday...

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    7string48 wrote:
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