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@jlr - CCC can't make a bootable backup of Big Sur (and beyond) because of the way that Apple now secures the system files:I'm having some trouble getting a bootable backup for Big Sur working. I had one working fine with Catalina. Carbon Copy Cloner seems to report that the APFS replication procedure failed. One question I have is related to first attached screenshot; I am unfamiliar with this snapshot partition, could that be causing a problem? From some research it seems like this might be time machine related, but I don't see the normal system and data volumes so I figured I would bring it up. The second screenshot is what I get when I try to run first aid in disk utility. With these problems, and the lack of a bootable backup due to Carbon Copy Cloner deleting my Catalina one, I'm a bit nervous. Any advice on how I should proceed? I haven't had any issues with Big Sur.
Just google "Carbon Copy Cloner Big Sur" and it should give you a link to the blog where they discuss it. (I tried to insert it here, but I don't think tonymacx86 allows links to external sites)
You're not doing anything wrong: It's not a fault, it's a feature!
I forget the workaround for this. I believe you make a fresh Big Sur install on your backup drive, then use CCC to copy over the files. But I haven't bothered to do this myself yet.