How to Make a Bootable Clone of Your Mac’s Hard Drive
There are a lot of reasons for wanting to boot from an external drive. If you’d like to keep files synced between a desktop and laptop, expand your storage, or have a bootable backup copy of your system, there’s a hidden feature in Disk Utility that makes it easy.
Generally, booting from an external drive will be slower, even with new Thunderbolt and USB-C drives. Those are still much slower than the solid state drives (SSDs) found in most new Macs. So while this isn’t recommended for daily use, it’s still possible.
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