I am definitely going to wait until an actual new version of SuperDuper! is released. Do not want to mess with any kind of beta release (so far, Dave has refused to do that, which is a wise move).

Also, on two other Mac discussion sites I visit, plenty of folks are having issues with Big Sur, whether it is 1) downloading it, 2) installing it, 3) using it, or 4) running third party applications. Glad I can just "sit on the sidelines now", and watch and learn.