Backup to swappable IDE?

I've been given a couple of swappable (power off before caddy removal)
IDE frames, and I'm thinking that one chassis and the two caddies
(loaded with identical 200G+ drives) might make a tolerable backup
system - simply back 'everything' up to one, swap them out the next
day, backup, swap, and so on.

My question is: is this within the realm of plausibility, or would I
be tilting at windmills? I'm hoping to avoid a tape drive - high
capacity = high dollars, lower capacity = too dang many tapes.

Any suggestions for an alternative backup solution would be welcome.
.

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