OK, making some progress here. I erase-then-copy to my external backup disk, which I gather puts an OS on it. Then I smart update to that disk. Now, when I Power-Boot, I am offered that external backup disk as a boot option. I choose that option and ... it boots to my internal disk. Duh? I can tell that because I put a file on my internal disk desktop, and it appears, and also that SysPrefs->StartupDisk shows only my internal disk, which I presume is confirming that that's the disk I'm booted to.
So I guess I succeeded in making a bootable backup, but I can't get my machine to boot to it!
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