Originally Posted by kevs
thanks Joe, point 1 I mean even if no failure, you can't restore your Mac HD unless bootable, which make it super easy where you see dock and everything come up real nice on restore-- But came come close right getting your Mac HD back to where it was right?
You could restore from a clone of the data volume, but your would first have to reinstall macOS and the run Migration Assistant to get all the applications, dat files and user settings. Then you still have to go through some re-installs, lots of setups, etc. I have done that several times recently and the entire process takes me for to six hours of dedicated work to get back almost to where I was.

Originally Posted by keys
And Parallels, what suggesting, could one in Catalina, and later Big Sur, boot into El Capitan? If so then technically, I don't need Parallels.
Nope you still need Parallels


If we knew what it was we were doing, it wouldn't be called research, would it?

— Albert Einstein