A Windows 10 Mobile Backup, Reset, and Restore FAQ
(All About Windows Phone)

My response to any oddity in the operation of a Windows 10 Mobile phone is usually to suggest a `refresh`. The usual cause of the oddity is that the phone has been taken through multiple OS branches and/or Insider rings, and it`s time to have a managed clearout. In the FAQ below, I cover most of your questions about backing up and refreshing.