iCloud Drive has deleted all my Documents and Desktop folders
Warning to all: iCloud Drive is DANGEROUS!!
I just upgraded a family Mac to MacOS Sierra.
They asked me to connect my iCloud account, I connected mine instead of my wife's.
Recognizing my mistake, I canceled the iCloud sync to prevent a dangerous merge of folders.
Guess what? The LOCAL folders got WIPED off. I lost ALL my files.
Fortunately I had backups and could restore as was yesterday, but it's a real shame on Apple.