This is not something that we anticipate you would need to do frequently, nor even proactively.
Carbon copy cloner m1 update#
If you would like to update the OS on the backup volume, you can boot your Mac from the backup and apply any updates via the Software Update preference pane in the System Preferences application. CCC can then use its own file copier to maintain the backup of your user data, applications, and system settings. Our recommendation: We recommend erasing the destination only for the purpose of establishing the initial bootable backup. Apple's APFS team acknowledged the request in June 2020 and clarified the requirements, and now we're waiting on the implementation. We made a feature request to Apple in September 2019 (FB7328230) to allow ASR to clone just the System volume.
To avoid deleting your snapshots and the rest of your backup, CCC will not update the System volume on the destination when System updates are applied to the source. As a result, every time an OS update is applied to the source, we 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 clone 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 cloned 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 cloned volume, restart your Mac while holding down the Option key (Intel Macs) or the Power button (Apple Silicon Macs), then select the cloned volume in the Startup Manager. We have reported this issue to Apple (FB8889774) and we are currently awaiting a response. Some Big Sur cloned volumes do 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 volumes cloned by CCC (whether CCC used ASR or its own file copier). Some Big Sur startup volumes don't appear in the Startup Disk Preference Pane
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