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OK, that makes sense. Now, because I couldn't do the backup with APFS, I was assuming that High Sierra couldn't manage APFS. It can! I reformatted the backup disk to APFS with the High Sierra machine I'm backing up, did another SuperDuper backup to it and ... Boot Manager couldn't see that backup again. Same problem.
So to the extent a backup is really being made, for some reason the Boot Manager can't see it. The backup disk icon is sitting the desktop, as normal, and, if I can click on it, it has inside what sure looks like a backup. So the issue is precisely with the Boot Manager.
As I said, if I format the disk as MacOS Extended, and do the backup, the Boot Manager can see the disk just fine.
I am sending you the SuperDuper log for that backup.
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