iTunes version 12.10.1.4

1. There is typically one rolling backup per device. Backups should persist through iTunes updates, though not perhaps when switching from the old school installer to the Microsoft Store release of iTunes. See Locate backups of your iPhone, iPad, and iPod touch - Apple Support to see where the backups are stored. If you've switched versions you could switch back, or move the data to the folder where the installed version looks for it.
2. See Sync your iPhone, iPad, or iPod using your computer - Apple Support. Note syncing is generally one way, library to device. If your library is missing media then syncing will likely remove anything you still have on the device. Start with Empty/corrupt iTunes library after upgrade/crash - Apple Community.

tt2

Check for updates from Windows Update.

tt2

Please, how do I do this?

Try https://support.microsoft.com/en-gb/help/4027667/windows-10-update.

tt2

Please help .. I have the same issue but using windows 8.1 .

And where does one delete posts here ?

Den