As a result, every time an OS update is applied to the source, you would have to erase the whole destination volume (including any existing snapshots on that volume) just to update the system on the destination. Right now, ASR will only copy whole volume groups (System and Data) we can't choose to copy just the System volume. That volume can only be copied using Apple's proprietary APFS replication utility ("ASR"). Starting in macOS Big Sur, the system now resides on a cryptographically sealed "Signed System Volume". CCC will not update the System volume on a Big Sur bootable backup if you want the Mac to always boot from the backup volume). When your Mac has completed booting, you can optionally choose to set the startup disk to the current startup volume (i.e. Workaround: To boot from the backup volume, restart your Mac while holding down the Option key, then select the backup volume in the Startup Manager. Apple resolved the issue in macOS Monterey. We reported this issue to Apple in Nov 2020 (FB8889774). When Apple's APFS replication utility is used to copy a Big Sur System volume (something that is now required on macOS Big Sur), however, the cloned volume will not appear in the Startup Disk Preference Pane, despite being perfectly bootable. In the past, the Startup Disk Preference Pane would list all available startup volumes, including CCC backup volumes. Some Big Sur startup volumes don't appear in the Startup Disk Preference Pane
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