Glad to hear you got a response so quickly--I usually use Super Duper when I'm around and I guess I'll continue to do so--seems my guess was pretty close.
I am interested now. I will take a look at that when I get home but I do seem to remember that the root directory is going to start at the volume you had selected. (e.g. Macintosh HD but not /Volumes/Macintosh HD)