Here's my experience. I did nightly bootable backups for years, with the intention of being able to pick up where I left off in the event of a hard drive crash leaving my boot up disk unrecoverable.
I don't think I've been able to do a single bootable backup in the M-chip era. I've used SuperDuper and I've used CCC. I've emailed back and forth with David Nanian. (Who by the way, is super responsive in email and has helped me out a ton.)
I gave up. Apple just makes it impossible in the modern Mac era. My Drives just don't do it. If it works for you, great! But my advice after trying to solve this for years is to embrace non-bootable backups because they are far more reliable.