Both articles say the command line tool asr (Apple Software Restore) is the only Apple-approved way to do make a bootable copy. CCC says they're using asr. Both

Both articles say the command line tool asr (Apple Software Restore) is the only Apple-approved way to do make a bootable copy. CCC says they're using asr. Both articles also say asr currently won't make a bootable copy of an M1-based Mac. Both articles seem to imply Apple is dropping the ball on supporting tools for the partition/system changes they're making. The CCC seems more like a rallying cry: > If Apple ships macOS Big Sur without fixing the underlying utilities that facilitate creating a bootable backup, you can choose to defer the upgrade. There is no urgency, no impetus to upgrade to macOS Big Sur. If we defer the upgrade choice, that sends a clear message that we're willing to wait for Apple to deliver quality software, rather than hitting an artificial deadline with an OS that's not ready.