Tap Search after sliding in from the right edge of the screen. In the search box, File History settings. Choose the network or external device you want to use by selecting Select a drive. Activate File History.
The $OF contains files whose pathnames are too long to be kept on your backup device, according to this answer on answer.microsoft.com. Additionally, File History is still the program Microsoft advises using for file backups even though Backup and Restore is a feature of Windows 10 itself. In stark contrast to Backup and Restore, File History's main function is to enable you to back up individual files rather than producing a full system image.
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