When you start the task, the destination will be immediately erased. When you select this option, CCC will configure the task to use Apple's APFS replicator to clone the selected source to the selected destination. We recommend that you dedicate a volume to the backup task, because the volume will have to be erased to establish a bootable backup. your macOS Big Sur startup disk) as the source to a task, and a destination that is not an already-established Big Sur volume, CCC will offer some choices for how to proceed with the task depending on how the selected destination is configured. When you select an APFS volume group (e.g. What to expect as you configure your first backup task For subsequent backups, CCC will use its own file copier and will copy just the differences from your Mac's Data volume.
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. CCC cannot use its own file copier to establish an initial bootable backup of your Mac's startup disk. 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. That seal can only be applied by Apple ordinary copies of the System volume are non-bootable without Apple's seal. Starting in macOS Big Sur (11.0), the system resides on a cryptographically sealed "Signed System Volume".
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