Quote from gnome:
HD cloning....
I have 2 HDs mounted so I can do a quick clone at any time (<1 minute with Casper XP 3.0, <3 minutes with Acronis True Image).
I also have 2 other HDs (out of the machine) which I rotate with the 2nd HD to keep all fairly current
I like your method (this is close to what I do). I use removable HD bays to make it fast to plug in the HDs for drive cloning and drive swapping.