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Eine gültige Signatur der Systempartion wird nur durch den Installer (ob frisch oder als update) von Big Sur generiert.
Oder halt durch Apples ASR was ja CCC benutzt.
https://bombich.com/kb/ccc5/cloning-macos-system-volumes-apple-software-restoreStarting in macOS Big Sur (11.0), the system resides on a cryptographically sealed "Signed System Volume"(link is external). That seal can only be applied by Apple; ordinary copies of the System volume are non-bootable without Apple's seal. To create a functional copy of the macOS 11 System volume, we have to use an Apple tool to copy the system, or install macOS onto the backup. CCC cannot use its own file copier to establish an initial bootable backup of your Mac's startup disk. When you configure a CCC backup task to make a clone of a Big Sur startup volume, CCC will use Apple's APFS replicator (named "ASR") to create the initial clone. For subsequent backups, CCC will use its own file copier and will copy just the differences from your Mac's Data volume.