Indeed, it would have been very thoughtful of Apple to have warned users:
By the way, don't rely on Time Machine to back up your system any more when they made these filesystem and security changes 5-10 years ago. Had I thought about it for 10 seconds, I could have realized this myself, but, you know, we have busy lives.
And busy I was, for the last two days, doing the wipe and reinstall of the production macOS, using instructions given
here and
here. I recommend reading both articles to get all of the nuances. Of course, when restoring from Time Machine I was warned that downgrading to a previous system was not recommended, and indeed there were a number of issues to clean up…
- Had to do all of the new-out-of-box crap: Enter Wifi password, language, fingeprint, iCloud, etc.
- All of my Full Disk Access and Accesibility permissions had been wiped.
- Mail.app database needed to be rebuilt.
- Most open tabs in Safari were gone.
- Last week's macOS security patch.
- Although it apparently remembered that Rosetta 2 had been installed and therefore did not warn me when I launched an Intel app (such apps just crashed on launch without explanation), Rosetta 2 needed to be reinstalled (Terminal command `softwareupdate --install-rosetta`).
…not to mention approving a lot of Terms and Conditions
So I bought a 1 TB SSD, and a license for Carbon Copy Cloner, with which I intend to do a
real backup before any macOS beta updates from now on. I am also going to consider maintaining separate partitions for
development and
beta macOs testing of my macOS apps, but as a one-person developer I've resisted this because I'd rather be testing while working.
Anyhow, thank y'all for the help.