Will I lose all my app data if I update to ios 7?

I know that ios 7 won't be coming until this fall, but thinking of updating raises many concerns. I already know that all my pictures, videos, and apps won't get lost if I back it up on my computer, so don't bring that up. What I'm really concerned about is if all my app data would get lost if I update my iphone to ios 7 even if I backed it up. I have a lot of games that I've spend a lot of time to get to higher levels, namely Injustice: Gods Among Us, Bike Race Pro, and Bookworm Heroes. So I really don't want to do them over again.

Will updating to ios 7 save all of my games' data? What should I do if it doesn't?

Update iPhone will not delete any iPhone files, only restore iPhone will do that. If you afraid losing the data, you can use iTunes to make a backup of your iPhone first, then update to iOS 7.

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