That seal is a guarantee that every last bit in the system is exactly as it was when it was installed, and matches perfectly with Apple’s original seal too. So long as the seal remains intact on that snapshot, nothing can change it, not even the system itself. From Big Sur, and almost certainly in Monterey, nearly all of what we refer to as ‘the system’ is not only a separate volume, but locked and sealed away in a snapshot which is mounted and used to boot from. MacOS may be Unix-like in many respects, but its system is now very different from what you’d expect to see elsewhere. This article looks at the way ahead with your Mac’s recovery system, and how useful re-installing macOS is as a generic solution to problems. While we could freely clone our boot disks to and fro, even using that as a method of defragmentation, cloning the system is now frowned upon and fraught with problems. The system itself has gone from an integral and largely mutable part of the boot disk to a sealed snapshot. Although Intel Macs still have a degree of flexibility, Apple Silicon Macs adopt a model in which, come what may, they have to start the boot process from their internal SSD. Mac boot disks have changed beyond all recognition over the last few years.
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