First, thank you for trying.
There's what I want and there's what I'm trying to do. 😉
Waving my magic wand, I'd like a bootable backup of my laptop's internal hard drive. This is what SuperDuper does. I would like it to be straightforward: I issue one command, then I can boot from the external hard disk to which I have backed up. For bonus points, restore is merely backup in the other direction.
That is what I'd like.
I'm cloning a drive with Clonezilla and tomorrow I'll try to boot to the backup drive. I would like to understand how restore works, but frankly, I'm not optimistic and I'm not currently eager to risk screwing up my laptop's internal hard disk.