Mac OS X ventura - best way to create a clone of my system drive for emergency recovery

I have a 24" M1 iMac. I attempted to use Clonezilla to create a bootable CD, to reimage the internal 256 gb drive to an external 256 gb drive for recovery purposes by booting to my external DVD drive. This didn't work - there is no way to boot a live CD under this configuration (**** you, Apple - always complicating things).


What is a supported method to achieve what I desire? I had a scare recently where I lost data, and when I attempted to use Time Machine to recover it said 1) I needed to reinstall OS X to do that successfully and 2) I lacked asuffic tent space to reinstall OS X. Clearly this is both unacceptable and dangerous. I'd appreciate any assistance that you can offer. Thank you!

iMac 24″, macOS 13.3

Posted on May 14, 2023 9:29 AM

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Posted on Jun 5, 2023 2:53 PM

I've tried both CCC and SuperDuper! to create a bootable clone. They don't work well. As HWTech noted, the developer of CCC says that Apple very much discourages trying to do this. The way Apple protects macOS from Big Sur forward, cloning the entire drive is not reliable.


There are two ways to do it that will work every time, and they are very similar. I use CCC.


First, use a separate drive, or create a hard partition on one large enough to hold your third party apps and personal data, plus at least 20% more room. The backup you make must have its own space and not be part of a shared volume.


  1. Use CCC to copy the main drive to the backup drive/volume. Do not have Legacy Bootable Copy Assistant on for the target drive. This will copy only your data and anything else that does not belong to macOS. As far as SafetyNet, I always have it off.
  2. Else, use Time Machine to backup your drive to the backup drive/volume.
  3. Install Ventura to the external drive normally. Create a bootable flash drive installer first if you wish, or connect online to Apple's servers.
  4. When the installer is almost done and it reaches the point where it asks if you have data to restore, choose yes. Then point it to your CCC or TM backup.


I don't use Time Machine, so can't comment on how the final install/restore works. But with CCC, there is one small but annoying issue. Any entries you had in the System Settings under Privacy & Security will be gone. You'll need to add them again as you launch your third party apps.

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Jun 6, 2023 8:10 AM in response to Owl-53

Excellent point, indeed!


I've never understood why Apple does that. A bootable drive is a bootable drive. Why does the Mac care if the internal drive isn't working?


Not only that, if the SSD dies on an iMac or mini (if not more models), the entire Mac is then junk since the drive is soldered to the main board. That's incredibly bad design.

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Mac OS X ventura - best way to create a clone of my system drive for emergency recovery

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