Booting from external drive using Monterey on Mx Macs

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MBP 16" 2023 (M3 Pro), iPhone 15 Pro, plus ATVs, AWatch, MacMinis (multiple)
For those of you who are planning to use a clone as a backup to Monterey on your Mx Mac, or for running older/beta versions of the OS, or for reducing security to install an extension that the OS doesn't like having installed, here is some interesting reading on the complications of booting Monterey externally.


Bottom line: It can be done, but there are implications of which you should be aware.
 

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