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Last week Microsoft started deploying its October 2018 update (called version 1809) for its Windows 10 operating system. Since then there have been reports of people losing some or all their personal files during the upgrade process. Here is a good summary of the issue from Engadget:
https://www.engadget.com/2018/10/05/windows-10-october-update-1809-delete-data-wipe-user-profile/
That article describes a tool and a setting normally not used or needed except in large corporations or