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OK, as noted, I can command the backup disk to be the "Startup Disk" (in System Preferences). When I do that, the machine reboots successfully to the backup disk.
But option-restart, which I gather is supposed to start something called the Startup Manager, STILL doesn't display the backup disk as a boot option. The only icon it displays to chose from is that of the internal disk.
So the SD clone seems to have been made, and I can boot to that clone, but not through the Startup Manager.
So I'm trying to understand. Is this a SD issue? Or a System issue? Or a backup disk issue?
BTW, this is one of two partitions on the backup disk. The other partition is for backup of another machine. I need to see if I can see that partition with the System Manager on the other machine. I think I once did that, but I'm not sure.
That's a nice idea of making a system backup on a thumb drive. But if I can't use the Startup Manager to boot to an external disk over USB, why should I expect to be able to boot to a thumb drive over USB with it? Are thumb drives treated differently, as volumes, than hard disks?
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