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<blockquote data-quote="Rod" data-source="post: 1831348" data-attributes="member: 204485">This I where the advantages of a bootable macOS installer really shine.I too had a corrupted macOS Mojave boot volume on my MBP.&nbsp; CCC clone was also fried and could not boot.&nbsp; It appears that whatever happened to the boot volume on my MBP got copied to the clone. That can be avoided by running a data check as part of the cloning process but it's much slower.I was saved a lot of time and effort by having a thumb drive with a bootable macOS installer.&nbsp; Even though it was a High Sierra installer I was able to boot, erase my internal drive (you have to do this to install an earlier OS) install HS then upgrade back to Mojave.&nbsp;&nbsp; All my personal data and apps on the clone were intact so just copied them back to the new version of Mojave. As an emergency recovery tool a bootable macOS installer on a USB thumb drive is cheap, easy to create at each major upgrade (you must do it before running the upgrade installer app because it is erased after use) and can be created using Terminal or a free app like DiskMakerX.It could also be used in conjunction with Time Machine to perform a retrograde install of a previous OS; erase with the USB drive, install previous OS, restore data from Time Machine.Sent from my iPhone using <a href="http://r.tapatalk.com/byo?rid=95677" target="_blank">Mac-Forums</a></blockquote>

[QUOTE="Rod, post: 1831348, member: 204485"] This I where the advantages of a bootable macOS installer really shine. I too had a corrupted macOS Mojave boot volume on my MBP. CCC clone was also fried and could not boot. It appears that whatever happened to the boot volume on my MBP got copied to the clone. That can be avoided by running a data check as part of the cloning process but it's much slower. I was saved a lot of time and effort by having a thumb drive with a bootable macOS installer. Even though it was a High Sierra installer I was able to boot, erase my internal drive (you have to do this to install an earlier OS) install HS then upgrade back to Mojave. All my personal data and apps on the clone were intact so just copied them back to the new version of Mojave. As an emergency recovery tool a bootable macOS installer on a USB thumb drive is cheap, easy to create at each major upgrade (you must do it before running the upgrade installer app because it is erased after use) and can be created using Terminal or a free app like DiskMakerX. It could also be used in conjunction with Time Machine to perform a retrograde install of a previous OS; erase with the USB drive, install previous OS, restore data from Time Machine. Sent from my iPhone using [url=http://r.tapatalk.com/byo?rid=95677]Mac-Forums[/url] [/QUOTE]

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