Which it turns out I needed because after I got home all three external drives attached to my desktop were reported as damaged beyond repair by the new Mac OS. Coincidence? Lucky that I had exactly the hardware I needed to dig out of the mess? Who knows!
Funny thing is it’s taking over 10 hours to do the copying. It won’t finish until tomorrow morning, Murphy-willing. When the disks got big, all of a sudden restoring from backups takes a lonnnng time.
And recapture some valuable screen real estate and a portion of your sanity.
defaults write com.apple.Dock no-glass -boolean YES
Thanks to Mark Johnson for the tip.