How to make a backup of app (game) data

[gaanee]

Is there a way to take a backup (current stage, score, etc..) of a game app?
I am currently playing one game and want to to delete but would like to backup data so that when I come back, I don't have to start from scratch and just resume from the current stage. The game doesn't seem to offer any way to take a backup, though I can log in through Game Center and Facebook.
Only option I found was to backup and restore the iPhone. I took a back up, deleted the app and reinstalled just to check, but after logging to Game Center, it didn't resume, so had to restore the iphone.
Is there a way to backup just one app?

 

[mofunk]

It depends on the app. You can backup to iCloud and it will save where you left off. Pick up where you left off onto another iOS device too.

I'm guessing if it is stored on another iOS device it will save where you left off.