Sometimes the Mac's firmware cannot detect your backup device Creating legacy bootable copies of macOS Big Sur.Some Big Sur startup volumes don’t appear in the Startup Disk Preference Pane.Our support for system copying and bootability on Big Sur and later OSes is limited to the suggestions noted above. If that does not produce a bootable device, then the device is not suitable for functioning as a bootable device on your Mac. If that does not produce a bootable volume, and if you have exhausted the Firmware Discoverability Troubleshooting steps below, then we recommend that you install macOS onto the backup. When you configure a CCC backup task using the Legacy Bootable Copy Assistant, CCC will automatically use Apple's proprietary APFS replication utility (ASR) to make a block-for-block exact copy of the source. This volume is cryptographically sealed, and 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, the system now resides on a "Signed System Volume". ![]() ![]()
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