how can I have a copy of the OS for an emergency boot?
Hi there! Is there a way of having a copy of the OS in a USB flash drive or external HD for a emergency boot? thanks and have a good one!
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Download macOS High Sierra on the Mac App Store, and then install macOS on that device instead of your usual startup disk. Just be sure to designate the proper installation location when you get to that installation step: click the installer's Show All Disks button, and choose the external disk or properly formatted flash drive.
To boot from it read How to select a different startup disk - Apple Support. No third party software is required.
