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<blockquote data-quote="Randy B. Singer" data-source="post: 1928783" data-attributes="member: 190607">I got this from Dave Nanian of SuperDuper! fame:&quot;Randy, there are and were *always* things that could not make something bootable. The OS on the backup might not support the Mac you're trying to boot from. There may be technical issues with software you've installed that tie it to the Mac you copied from. The drive might have issues with one Mac or another. None of these things are new. There are more issues that might happen with Apple silicon Macs.The article is talking about ownership of the secure keys and users for boot. But it also explains (at the end) how you can deal with that to enable boot if you're having trouble. As always, there may be other issues! This is just one new one because of the new architecture of Apple silicon, and how it interacts with macOS.The key—and this is important—is that the *data* on the drive (apps, settings, data, etc) can be restored even if you have a boot issue. That's the most important thing!&quot;So, I guess that it comes down to the fact that we all need to back up our data, because drives can and do fail.&nbsp; We only have two choices in type of backup: clone or versioned.&nbsp; Both have their advantages and disadvantages (which we can discuss, if you like), but I find a clone backup, even one that you can't boot from, to be the more useful of the two.</blockquote>

[QUOTE="Randy B. Singer, post: 1928783, member: 190607"] I got this from Dave Nanian of SuperDuper! fame: "Randy, there are and were *always* things that could not make something bootable. The OS on the backup might not support the Mac you're trying to boot from. There may be technical issues with software you've installed that tie it to the Mac you copied from. The drive might have issues with one Mac or another. None of these things are new. There are more issues that might happen with Apple silicon Macs. The article is talking about ownership of the secure keys and users for boot. But it also explains (at the end) how you can deal with that to enable boot if you're having trouble. As always, there may be other issues! This is just one new one because of the new architecture of Apple silicon, and how it interacts with macOS. The key—and this is important—is that the *data* on the drive (apps, settings, data, etc) can be restored even if you have a boot issue. That's the most important thing!" So, I guess that it comes down to the fact that we all need to back up our data, because drives can and do fail. We only have two choices in type of backup: clone or versioned. Both have their advantages and disadvantages (which we can discuss, if you like), but I find a clone backup, even one that you can't boot from, to be the more useful of the two. [/QUOTE]

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