I will need to use CCC to make bootable backups the "old fashioned", direct way.
The "old fashioned, direct way?"
Did you not read the Bombich link I provided above? Here is what it says in the
very first paragraph:
"CCC 5.1.23 can now make bootable backups of a Big Sur startup disk on Intel-based Macs."
So, just like before Big Sur, one can use CCC on Intel-based Macs even with Big Sur. And that is what I mean by "direct".