[ddouglass]

George this will not work for a laptop.

C: takes a dump. You're in the middle of a show. You can switch to D: immediately, and continue on. Later you can clone d: to c: to do a restoration. You must use two drived with cloning...a USB drive for laptops, either type for desktops.

You cannot boot from a USB drive plugged into a laptop nor can you hook up a laptop drive (one that fits with the correct connector) as an external.
That is what I was trying to say before. The only way I can see him doing this is to setup a second cloned laptop drive before the problem occurs and keep it with his equipment. That way he could stop and swap out the drives. This would require creating a clone on an external, then clone that to the second laptop drive every time you make any changes.