https://www.theregister.co.uk/2018/10/10/microsoft_windows_deletion_bug/ > The world now knows why last week's Microsoft Windows 10 upgrade deleted unlucky users' files: the software treated the default user directory as ripe for destruction, because it thought the files were elsewhere. The upgrade has since been pulled. > Last week, some unfortunate punters who hit the “download” button on the Windows 10 October 2018 Update received the gift of extra disk space, because they lost their \Documents directories.