OP:
Not sure if I mentioned this earlier.
Since the introduction of the m-series CPU, and with the latest OS releases, whether or not you can create a bootable clone seems to depend on WHAT KIND OF DRIVE you're using for the backup.
The first times I tried to create a bootable cloned backup for my MacBook Pro 14", it failed.
That's because I was trying to create the clone on an OLD platter-based hard drive in a PATA (not SATA) enclosure, which was USB2 at best.
The data would be all "cloned over", BUT... the drive would not become bootable.**
For a while, I figured that bootable clones were a thing of the past with the new Macs.
BUT...
Then I tried creating a bootable clone using an SSD and SuperDuper.
Went right through the first time without problems.
I set up the "options" in SD to
erase the drive
copy the entire drive to the backup
The backup boots.
I can "incrementally update" the clone using either SuperDuper OR CarbonCopyCloner.
For many years on this forum, I have been a staunch advocate of CCC.
For some reason, Mr. Bombich seems to have made it increasingly harder to create a bootable backup using his latest versions.
I'd like to see a "one-touch" option in CCC to create a "legacy backup", right up in the menus, easy to find (so easy that it "jumps out" at you), easy to use.
It may not be for everyone any longer.
But... it should still be there for those who want it.
**drive SPEED and the control interface seem to have something to do with this.
Too slow = no boot