Jeremy,
Keep in mind that mirroring and cloning/imaging are not the same thing. [...] They are two different applications with two different objectives. Use mirroring for your media and imaging/cloning for your O/S or boot disk.
Dan
Yes, you're right - though in my case it amounts to the same thing as I keep my media on my boot disk

I was just drawing the distinction between mirror/clone software and archive software like Retrospect.