@prism That's terrible - what an awful thing to have happened to you, and what a stupid set of decisions from Microsoft.

Do you mind if I ask about how your computer decided to delete your local copies? I would like to be able to usefully advise members of my family who use Windows.

I'm mainly interested in how it was deciding to switch files over to being online only - could you tell if it was a disk space issue, or just files over a certain age, or was there no apparent rhyme or reason?