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Apple Computing Products:
macOS - Apps and Programs
The demise of Bootable macOS Clones?
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<blockquote data-quote="Lifeisabeach" data-source="post: 1882988" data-attributes="member: 38864"><p>My bad. I meant Thunderbolt.</p><p></p><p></p><p></p><p>The developer of CCC has instructions on what to do. I even pasted the relevant details in a prior post.</p><p></p><p></p><p></p><p>It's speculative as to whether or not it will work in such an event. Should we assume it's not possible and just not have a bootable copy, or act on the assumption that maybe it will and do have one? This is just my opinion, but hoping for the best and being prepared covers you either way. If it turns out you can't boot off a bootable external in the event of a failed internal, then you made a backup that can't be booted. At least the data is on it. If you don't make a bootable backup and it turns out it COULD have been bootable in spite of a failed internal, well yer out of luck.</p><p></p><p>I see value in having a bootable backup in the event of some sort of corruption to the system volume that renders it unstable or unbootable, yet a solid bootable backup can still be used because the hardware is still good. It's a bit inconvenient that new hardware is required to have a bootable backup, but on the other hand this may imply that a proper Thunderbolt external drive will be seen as the same as an internal drive and thus will contain the cryptographically signed system volume that is required for booting. It's speculation on my part, but guys... remember that Thunderbolt connects directly to the system bus (if I'm saying that right) and anything connected via Thunderbolt operates at full speed as if it was an internal device. Installing Big Sur may well mean that the cryptographically signed system volume is created. I've installed macOS to external drives before, but the prompt I got to select an existing admin user on the boot volume is a whole new one to me.</p><p></p><p>EDIT: I just ordered an external Thunderbolt drive from OWC. I can't prove if it will be bootable in the event of a failure of the internal SSD, but by golly I'm going to make it bootable otherwise!</p></blockquote><p></p>
[QUOTE="Lifeisabeach, post: 1882988, member: 38864"] My bad. I meant Thunderbolt. The developer of CCC has instructions on what to do. I even pasted the relevant details in a prior post. It's speculative as to whether or not it will work in such an event. Should we assume it's not possible and just not have a bootable copy, or act on the assumption that maybe it will and do have one? This is just my opinion, but hoping for the best and being prepared covers you either way. If it turns out you can't boot off a bootable external in the event of a failed internal, then you made a backup that can't be booted. At least the data is on it. If you don't make a bootable backup and it turns out it COULD have been bootable in spite of a failed internal, well yer out of luck. I see value in having a bootable backup in the event of some sort of corruption to the system volume that renders it unstable or unbootable, yet a solid bootable backup can still be used because the hardware is still good. It's a bit inconvenient that new hardware is required to have a bootable backup, but on the other hand this may imply that a proper Thunderbolt external drive will be seen as the same as an internal drive and thus will contain the cryptographically signed system volume that is required for booting. It's speculation on my part, but guys... remember that Thunderbolt connects directly to the system bus (if I'm saying that right) and anything connected via Thunderbolt operates at full speed as if it was an internal device. Installing Big Sur may well mean that the cryptographically signed system volume is created. I've installed macOS to external drives before, but the prompt I got to select an existing admin user on the boot volume is a whole new one to me. EDIT: I just ordered an external Thunderbolt drive from OWC. I can't prove if it will be bootable in the event of a failure of the internal SSD, but by golly I'm going to make it bootable otherwise! [/QUOTE]
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Apple Computing Products:
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The demise of Bootable macOS Clones?
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