This is a feature in Windows 8, 10 and 11, which allows you to automatically save copies of all your files to another location (such as an external hard drive), so that you can get them back if they are lost or damaged
To access File History right mouse click on the Start Menu button and choose Control Panel then select System and Security > File History
Firstly you need to click Select drive to choose which hard drive or network location you wish to use to store your backup files
You can then click Turn on and the initial backup of your files will begin automatically
If you wish to exclude certain locations from being backed up then click Exclude folders
To restore a damaged or deleted file click on Restore personal files, and you will see the screen below where you can browse your backed up files and choose which one to restore, and where you wish to restore it to