To backup your progress in Rivengard, you need to make sure your game is connected to Game Center.
To connect to Game Center, follow these instructions:
Tap on ‘Settings’ icon for your iPhone
Search for ‘Game Center’ and tap on it
Enable Game Center in the phone and create a profile (if you don’t already have one)
Open the Rivengard app
Tap on the Settings icon in the top left corner
Tap on ‘Connect’ (green button)
The app will automatically try to connect to Game Center with your logged in account
Remember to make sure that you have Game Center enabled. Without doing this, you won’t be able to connect it to Rivengard.
To do this:
Go to the settings of your iOS device
Navigate to Game Center
Swipe the tab to enable Game Center – it may prompt you to log with using your Apple ID