The "update" involves downloading system resources and then personalizing the backup volume's OS to the current Mac. You can update now or select another startup disk. If you attempt to boot your Mac from the backup of some other Mac, your Mac will refuse to boot from that volume, claiming:Ī software update is required to use this startup disk.
When macOS is installed onto a T2 or Apple Silicon Mac, the macOS Installer signs some of the startup resources with a code signature that is unique to your Mac. T2 and Apple Silicon Macs have "personalized" operating systems If such an update is not available, use the Migration Assistant instead. For example, if your newer Mac came with 10.12.4, update your source Mac to 10.12.5 before migrating. When cloning your source Mac to your new Mac, be sure that your source Mac has been updated to at least one later release than what came on the newer Mac. If your new Mac is just different, but not really hot off the production lines, then cloning another Mac to the new Mac may work fine. If your new Mac is brand new, use Migration Assistant to migrate your data to your new Mac. If you install an older version or build of the OS, for example by cloning your older Mac to it, then it may behave unexpectedly, or it may not boot at all. When you get a brand new Mac from Apple, it has a specific version of macOS installed on it, and further, a build that is specific to that exact model of Mac. Don't install older versions of macOS than what your computer shipped with
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