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This is an excellent article on what can and cannot be done with external bootable drives on Mx Macs.
I know we've had lots of discussion here about bootable clones of Mx Macs, but Howard's summary says it better than I've seen expressed anywhere.
NOTE: In a business environment, where it might make sense to have a spare Mx Mac sitting around for emergency use, a clone could be useful to restore to that spare. But if the internal storage of an Mx Mac fails, that bootable clone probably won't boot on the failed Mac in any case, as Howard explains.
Should you make an emergency disk for an Apple silicon Mac?
Many of us keep an emergency external drive at the ready by our Mac, in case we need to use it to recover from problems. What’s the equivalent for Apple silicon?
eclecticlight.co
I know we've had lots of discussion here about bootable clones of Mx Macs, but Howard's summary says it better than I've seen expressed anywhere.
NOTE: In a business environment, where it might make sense to have a spare Mx Mac sitting around for emergency use, a clone could be useful to restore to that spare. But if the internal storage of an Mx Mac fails, that bootable clone probably won't boot on the failed Mac in any case, as Howard explains.