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  #1  
Old 11-07-2021, 10:09 PM
Dan Lester Dan Lester is offline
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no more bootable backups???

Maybe I'm missing something, but how do you do a bootable backup with SuperDuper? I spent a decade or so on Mountain Lion, and it worked beautifully. Now I've migrated to Big Sur and I can't get my OS to see an external disk. SysPrefs->Startup disk only shows my internal drive, and restart->option only does as well. Am I led to believe that SuperDuper can't do bootable backups anymore with modern operating systems?

Now, SuperDuper still does a nice data backup, but I want a BOOTABLE backup!
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Old 11-08-2021, 06:58 AM
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dnanian dnanian is offline
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You've missed something. SuperDuper continues to make bootable backups.

I explain the process at http://www.shirt-pocket.blog (and it should also indicate what's going on in the "What's going to happen?" section).
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Old 11-08-2021, 08:43 AM
Dan Lester Dan Lester is offline
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Hmm. I guess I did miss that. Thank you. But OK, my container backup disks are already all APFS. I do a Smart Update to them, which is supposed to be the same as "Erase then copy", and I get a backup. But what I don't understand is how I actually boot from that backup. As I said, my backup disks aren't listed as choosable options in SysPrefs->Startup disk, and reboot-with-Option doesn't show them either. Specifically, how do I tell my machine to boot from the backup instead of the system disk?

Now, I have always valued boot-from-backup in case my system disk gets fried. Then I just replace that disk, I boot-from-backup, and copy the whole thing over to my replaced disk. But it occurs to me that now that my system disk is an SSD, that's much less likely to happen than it used to. So maybe boot-from-backup isn't as important to me anymore.

Boot-from-backup is one of the reasons that I don't depend on Time Machine. With Time Machine, if your system disk craps out, you need to FIRST replace the OS when you replace the disk, and only THEN can you do a restore.

Last edited by Dan Lester; 11-08-2021 at 08:57 AM.
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Old 11-08-2021, 09:18 AM
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dnanian dnanian is offline
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Smart Update, under Big Sur and later, is not the same, as it should say in "What's going to happen?" near the bottom.

Specifically, it does not copy or update the OS.

So, when made properly, it'll show up in Option+Boot (Intel) or Power+Boot (M1).
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Old 11-08-2021, 01:05 PM
Dan Lester Dan Lester is offline
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OK, making some progress here. I erase-then-copy to my external backup disk, which I gather puts an OS on it. Then I smart update to that disk. Now, when I Power-Boot, I am offered that external backup disk as a boot option. I choose that option and ... it boots to my internal disk. Duh? I can tell that because I put a file on my internal disk desktop, and it appears, and also that SysPrefs->StartupDisk shows only my internal disk, which I presume is confirming that that's the disk I'm booted to.

So I guess I succeeded in making a bootable backup, but I can't get my machine to boot to it!
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Old 11-08-2021, 03:43 PM
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dnanian dnanian is offline
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What specific external drive is it? Is it attached directly to the Mac? Is there one one partition on it?

This may get into details about your system that are better to handle off-forum, Dan. Send email to support, eh?
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