Re-upload or add back icloud backup apps
According to this Apple Support page, you can add apps to iCloud backup on the iPhone this way:


  Select which iOS apps to back up
  
  Many apps automatically back up to iCloud after you install them. You can change which apps back up to iCloud and remove existing backups from your storage.
  
  Use these steps on your iPhone, iPad, or iPod touch:
  
  1.Tap Settings &gt; iCloud.
      *  If you're using iOS 8 or later, tap Storage &gt; Manage Storage.
      *  If you're using an earlier version of iOS, tap Storage &amp; Backup &gt; Manage Storage.
    2.Tap the name of your iOS device.
    3. Under Backup Options, turn on any apps that you want to back up.