macOS: Attribute Not Found?

from blog The Desolation of Blog, | ↗ original
I have a bit of a mystery, and I'm hoping that my readers can help me with it. When I was manually backing up my M1 MacBook Pro today, I experienced something bizarre that I can't explain. Last year I wrote about my backup strategy for my new MacBook Pro. What I do is boot into recovery, mount the Data volume, and then run the following commands...