Carbon Copy Cloner

New convert to macOS from a lifetime using Windows, my question is I used to use Macrium to create full bootable disk image clones to an external drive that could be used in case of a FUBAR update or unexpected issues, I could always rely on using Macrium to get me back up and running within minutes, basically plug the drive in, start the PC at the boot screen and run it.


Does CCC more or less offer the same for Mac?

Time Machine seems very limited and would require the base OS to be installed prior to it's use which to me is ridiculously time consuming, please correct me if I'm wrong on this.

MacBook Pro (M2 Max, 2023)

Posted on Apr 3, 2023 11:33 AM

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Posted on Apr 4, 2023 9:27 AM

Yes. But also maybe depending on the Mac and version of macOS involved. Apple's increased security features are making it more difficult to make a bootable clone of macOS. I believe bootable clones are still working on the Intel Macs, but I've seen mixed reports on these forums for the Apple Silicon Macs these days.


One user recently mentioned that Apple's ASR utility is currently known to be broken with Ventura. CCC must utilize the Apple ASR utility to make a bootable clone these days. This user mentioned Michael Bombich the developer of CCC recently mentioned this....may need to search the CCC site & documentation for this reference.


To use CCC to make a bootable clone, the destination must be erased as well as right-clicking on the destination in CCC and selecting "Legacy boot" option. The developer of CCC a couple years ago mentioned that bootable clones are now just a "best effort" and recommends a different method of using CCC to keep a spare bootable drive up to date.

https://bombich.com/kb/ccc6/cloning-macos-system-volumes-apple-software-restore


I have not checked for more recent news or updates from CCC regarding the state of bootable clones with Ventura or Apple Silicon Macs.


FYI, CCC traditionally used to use a file copy mechanism for the cloning process and recreating the hidden recovery partition/volume. With macOS 11.x+ CCC now must utilize the Apple built-in "asr" utility in order to transfer the APFS volume/snapshot to another drive since the system boot volume is now signed & sealed beginning with macOS 11.x+. CCC still uses a file copy process for older bootable clones (macOS 10.15 & earlier) or when syncing backup data...unable to sync the system files these days.

Signed system volume security in iOS, iPadOS, and macOS - Apple Support


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Question marked as Top-ranking reply

Apr 4, 2023 9:27 AM in response to CornishRattler

Yes. But also maybe depending on the Mac and version of macOS involved. Apple's increased security features are making it more difficult to make a bootable clone of macOS. I believe bootable clones are still working on the Intel Macs, but I've seen mixed reports on these forums for the Apple Silicon Macs these days.


One user recently mentioned that Apple's ASR utility is currently known to be broken with Ventura. CCC must utilize the Apple ASR utility to make a bootable clone these days. This user mentioned Michael Bombich the developer of CCC recently mentioned this....may need to search the CCC site & documentation for this reference.


To use CCC to make a bootable clone, the destination must be erased as well as right-clicking on the destination in CCC and selecting "Legacy boot" option. The developer of CCC a couple years ago mentioned that bootable clones are now just a "best effort" and recommends a different method of using CCC to keep a spare bootable drive up to date.

https://bombich.com/kb/ccc6/cloning-macos-system-volumes-apple-software-restore


I have not checked for more recent news or updates from CCC regarding the state of bootable clones with Ventura or Apple Silicon Macs.


FYI, CCC traditionally used to use a file copy mechanism for the cloning process and recreating the hidden recovery partition/volume. With macOS 11.x+ CCC now must utilize the Apple built-in "asr" utility in order to transfer the APFS volume/snapshot to another drive since the system boot volume is now signed & sealed beginning with macOS 11.x+. CCC still uses a file copy process for older bootable clones (macOS 10.15 & earlier) or when syncing backup data...unable to sync the system files these days.

Signed system volume security in iOS, iPadOS, and macOS - Apple Support


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