I read that blog in January. Unfortunately, SD! no longer will make even an initial Big Sur bootable backup. CCC can. What the future holds in store is not known, and both SD! and CCC may end up as data (only) backup applications - that’s where CCC is going and the developer has said so (a “better TM”). SD! (Dave) hasn’t been as specific about the future. I really liked SD! and as I said have used it for years (I even bought a second license to say thanks) but gave up in 2020 - CCC was more flexible and significantly faster in performing the backups. I sympathize with both developers - it is dangerous to rely on Apple (ASR) even if Apples fixes it so that it can make system volume only backups and work with M1 systems. For those who really want a bootable backup you can run asr from the command line but that’s a bit too complex for me.
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