Two different announcements from the same iPhone with the same iTunes connection
After restoring your device iTunes will not link it to the previous backup. Your backup whatsoever nonetheless exists. You can find a list of your backups in iTunes Preferences > Devices / If you're using iTunes for Windows, choose Edit > Devices. 

By what I understood your first screenshot is before restoring and your second screenshot is after restoring, therefore it makes sense.

Nothing to worry about. Doing a new backup will not delete your old one.