I use a crappy netbook for all these new builds. When I updated 1803 to 1809 with an iso, after it was finished installing I noticed lots of bandwidth being used. So I looked in process explorer and it was onedrive sucking down all my available bandwidth so I killed it. I was shocked. I don't use onedrive and had it disabled. I had to disable it again. 1809 re-enabled it and I have no idea what it was doing. I didn't lose any data and I'm thinking onedrive may play a part in this data deletion idiocy.