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Old 05-25-2020, 01:11 PM
derekw derekw is offline
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Join Date: Aug 2008
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"Save to Image: Read Only" is greyed out

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.
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