What happens if I delete my iCloud backup?

I need to replace my iPad because the screen is cracked, but I don't want to loose the data on some of my games. So to make room on iCloud for my games I'm considering deleting the back up for my iPad and my old iPhone and then only backing up the stuff from my iPad I want to keep.

What all will this do the data on my iPad, like specifically my camera roll and photostream?

Back up to a computer, then you don't have to delete anything from your iCloud and its easier that way. Btw, if only your screen is broken, then you can just replace that instead of the whole iPad.

Don't over-complicate the situation. Just have the screen replaced.

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