Windows10 October 2018 Update Deleting User Data

CaptainPhoton writes: I updated my test PC's using the Windows 10 October Update (1809). That seemed safe enough, so I proceeded to upgrade my production PC's. I just encountered an issue where everything in the Documents folder was deleted, even though I clicked the option to keep my files. Everything else in my user profile remained intact. I am curious, how widespread is this issue? Anyone else here seen this today? Some articles are starting to pop up with regard to the failure. Friends, please run backup before taking the October Update!