Pre-Mojave: It used to be if you had an external HDD or SSD (not the boot
drive) that Finder would allow you to do an "encrypt-in-place" on it in the
background.
Mojave and later: Finder allows me to *decrypt* a mounted & encrypted APFS or
Mac OS Extended drive, but the option to go the other w
Pre-Mojave: It used to be if you had an external HDD or SSD (not the boot
drive) that Finder would allow you to do an "encrypt-in-place" on it in the
background. That option no longer shows up.
Mojave and later: Finder still allows me to *decrypt* a mounted & encrypted
APFS or Mac OS Extended
