Maybe not . . . ;^)
That sounds like what I'm wanting to do. Except I dont really need a clone of my iMacs internal HD because thats what Time Machine is for, I just want to back up the external HD that Time Machine Saves everything to. Someone mentioned something about a disk image of my iTunes library and putting it on another separate external HD. Does that sound like it would work and work well. I dont need it to be updated everyday, or even every week. Maybe like once a month.
The reason I do a clone is that if/when your internal hard drive fails, you'll
have a *bootable* copy on an external drive that can get you back up and
running in the minimum amount of time. Yes, it may be a little out of synch
with the internal HD, but *that's* what TimeMachine is for. (IMO)
In other words, get back running with the clone, copy it to your new internal
HD, then use TM to bring the copy up to whenever your last TM backup was.
My only experience in this happened about a year ago on a G5 iMac, and I
had a similar setup (2 external 250GB HDs). When the internal drive failed,
I had the Apple guys replace the drive (it was still under AppleCare), then I
came home and booted from the external clone and copied it back to the
new clean drive, and was back to where I left off in about 2 hours.
And another experience I had was updating the G5 to my current C2D iMac.
Using TM as the source for my files did *not* work well - it did not find the
current backed up versions of many apps, and never did find my iTunes
library (9000+ songs/audiobooks/podcasts). Thank goodness those were
on my bootable copy HD - after reinstalling the apps, I merely copied the
library files, and was up and running in minutes.
Hope this helps . . .