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Thanks for your quick reply. I figured you knew what was going on. It's not a harmful error because a later Time Machine seems to work. I'll just continue using both Time Machine and SuperDuper and dismounting the Time Machine disks temporarily for SuperDuper. I want to have at least two independent/different types of backup.
It seems that simple things used to be easier before Catalina and Big Sur. Now it's getting more complex. Although I like the stability of Catalina (I have a new Macbook Pro which is about one year old and it has never experienced a kernel panic or a freeze, at least not yet, it is still on Catalina).
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