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I rely heavily on SuperDuper! for my backups. I have not needed to boot from such a backup many times due to an emergency, but I have used such a method like AniMill did for doing a clean, fresh installation of the Mac OS, and then subsequently migrating/copying needed files, folders, apps, settings, etc. from that backup. Sure has been fool proof for me.
Apple has been making life more and more difficult as each year goes by. This "event" is, and will be, an abortion.