What I see there is
My Backup Isn't in Startup Disk Preferences!
Often the backup won't show up in the Startup Disk Preference pane. That's OK! As mentioned in a previous post, you should use Option+Boot (on an Intel Mac) or Power+Boot (on an Apple silicon Mac), and it should show up there.
But, as I said, the disk doesn't show up in Power+Boot either.
In Disk Utility, these partitions looks EXACTLY the same. Maybe I need to just erase the whole disk and repartition?
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