https://www.pcgamer.com/the-windows-10-october-update-is-deleting-files-according-to-complaints/

Microsoft is rolling out its second annual Windows 10 update, known as the October 2018 Update (or Redstone 5), and some users report having trouble with it. The most egregious so far are reports of the October update deleting files.

"I have just updated my windows using the October update (10, version 1809) it deleted all my files of 23 years in amount of 220gb. This is unbelievable, I have been using Microsoft products since 1995 and nothing like that ever happened to me," a user wrote on Microsoft's support forum.