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#1
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If the OS doesn't support APFS, we would copy to a non-APFS disk...? And if the OS doesn't support APFS (eg 10.12) we won't.
If the firmware hasn't been updated for boot-time APFS support, we don't know - that capability isn't exposed. But installing the OS (rather then restoring) will ensure that the firmware is updated...these things are distributed with installers.
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--Dave Nanian |
#2
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Sorry, not being clear here. If you connect an APFS disk to an OS that does not know how to communicate with APFS, SuperDuper will STILL try to copy, and takes time grinding away seeming to do it. But what you end up with, after a long wait, is a disk that won't boot, and probably doesn't even have a copy on it. My point is that SuperDuper doesn't seem to recognize that it's trying to copy to a disk that the OS formally can't communicate with, and you don't find out until the disk doesn't work. Are you saying that SuperDuper has no way of polling the disk to see if it is really writable?
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#3
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No, Dan, it won't. If the system does not know how to communicate with APFS, the drive won't even mount.
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--Dave Nanian |
#4
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That makes sense but, as I recall, when I plugged that APFS SSD in to my High Sierra 2011 Mac, an icon DID appear on the screen. That's why I assumed I could back up to it. And when I commanded SuperDuper to back up to it, it ground and ground for twenty minutes and pretended to be backing up. It was only when I tried to boot from that backup twenty minutes later that the SSD didn't show in the Boot Manager. That is, the Boot manager knew that it wasn't a compliant disk, but SuperDuper didn't seem to be aware that it wasn't.
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#5
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Dan, it made the copy as it should. It didn't "pretend" to back up. (Feel free to send me the log to verify.)
If the boot manager doesn't see it, it may have had the wrong partitioning scheme, or High Sierra had never been *installed* to the system (it had been restored, or copied from elsewhere) and thus the BIOS doesn't have APFS capability, even if the *system* does.
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--Dave Nanian |
#6
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OK, that makes sense. Now, because I couldn't do the backup with APFS, I was assuming that High Sierra couldn't manage APFS. It can! I reformatted the backup disk to APFS with the High Sierra machine I'm backing up, did another SuperDuper backup to it and ... Boot Manager couldn't see that backup again. Same problem.
So to the extent a backup is really being made, for some reason the Boot Manager can't see it. The backup disk icon is sitting the desktop, as normal, and, if I can click on it, it has inside what sure looks like a backup. So the issue is precisely with the Boot Manager. As I said, if I format the disk as MacOS Extended, and do the backup, the Boot Manager can see the disk just fine. I am sending you the SuperDuper log for that backup. |
#7
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Install the OS on this system, Dan. (Sorry, didn't connect the log - which I got before this - to this forum thread.)
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--Dave Nanian |
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