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I'm trying to get my head around this....
I have a few backups of my Mini done with SuperDuper.
Two are on partitions on a 8TB Seagate USB 3 external that requires an external power supply and two are on a 2TB USB 3 external portable powered via the USB 3 cable.
I don't think powering makes any difference, but I thought I mention that.
In each case, the drives are partitioned into 500 MB volumes.
When I boot up the Mini holding down the option key -
with the 8 TB drive connected, only the Mac Mini internal drive shows up - neither one of the back ups do, and
with the 2TB drive (and the 8 TB drive) connected, both backups that are on the 2 TB drive show up and the internal of course. Booted from one of the back-ups, that worked fine.
All the drives, including the backups on the 8 TB drive show up on the desktop, show up when I boot into the internal.
Both drives are connected directly to a USB 3 port on the Mini, not via a hub which I thought might be the problem.
Basic question - if I check the files and folders of the backups that don't show when I boot up with the Option key (ie I assume for some reason they didn't get backed up properly and made "bootable") is there some file or folder that determines if a back up is bootable that I could look for and that might be missing?
From a practical point of view it's not an issue since the most recent back up worked fine, but I would still like to understand what might have happened.
I have been using SD and occasionally CCC for many, many years now and can't remember this ever happening before.
Both drives btw were partitioned with GUID
I have a few backups of my Mini done with SuperDuper.
Two are on partitions on a 8TB Seagate USB 3 external that requires an external power supply and two are on a 2TB USB 3 external portable powered via the USB 3 cable.
I don't think powering makes any difference, but I thought I mention that.
In each case, the drives are partitioned into 500 MB volumes.
When I boot up the Mini holding down the option key -
with the 8 TB drive connected, only the Mac Mini internal drive shows up - neither one of the back ups do, and
with the 2TB drive (and the 8 TB drive) connected, both backups that are on the 2 TB drive show up and the internal of course. Booted from one of the back-ups, that worked fine.
All the drives, including the backups on the 8 TB drive show up on the desktop, show up when I boot into the internal.
Both drives are connected directly to a USB 3 port on the Mini, not via a hub which I thought might be the problem.
Basic question - if I check the files and folders of the backups that don't show when I boot up with the Option key (ie I assume for some reason they didn't get backed up properly and made "bootable") is there some file or folder that determines if a back up is bootable that I could look for and that might be missing?
From a practical point of view it's not an issue since the most recent back up worked fine, but I would still like to understand what might have happened.
I have been using SD and occasionally CCC for many, many years now and can't remember this ever happening before.
Both drives btw were partitioned with GUID