derekw
05-25-2020, 01:11 PM
I try to create an image of a disk, the first two choices are available (sparseimage, sparsebundle) but the choice that I want is greyed out (read only). I can't figure out why.
I'm still running High Sierra. The source is an external HDD (APFS). I tried two different destinations and neither worked (an external APFS HDD; an internal HDD HFS+ volume that's not the startup volume).
If anyone wants to know why I want to create read only image, it's because I want to create a snapshot of my disk when I feel it's entirely problem free and store the image as an archive. I also have a separate bootable clone that I smart update regularly but sometimes problems don't show up immediately and I might have backed up a problematic drive to my clone so I would have no more good backup. Saving an archive image periodically is an extra safety measure. As for why a read only image instead of a sparsebundle, it's because read only image can have High Compression whereas a sparsebundle takes up the same size as the source disk's data.
If there are better ways to create archive image please let me know.
I'm still running High Sierra. The source is an external HDD (APFS). I tried two different destinations and neither worked (an external APFS HDD; an internal HDD HFS+ volume that's not the startup volume).
If anyone wants to know why I want to create read only image, it's because I want to create a snapshot of my disk when I feel it's entirely problem free and store the image as an archive. I also have a separate bootable clone that I smart update regularly but sometimes problems don't show up immediately and I might have backed up a problematic drive to my clone so I would have no more good backup. Saving an archive image periodically is an extra safety measure. As for why a read only image instead of a sparsebundle, it's because read only image can have High Compression whereas a sparsebundle takes up the same size as the source disk's data.
If there are better ways to create archive image please let me know.