If I have an ios 4, and update to ios 7, will the backup save all my important stuff?

So I have an iPhone 4, ios 4. I haven't updated it for no specific reason, but I want to update it to the new ios 7. My question is, will my backup save all my notes and numbers and messages and will that all be viewable in ios 7?

Yes it will. I updated my 4s a year ago and everything's was still there.

Everything should stay but if you want to be on the save side, back your phone up to your computer before hand just on the off chance that something goes wrong (which it shouldn't) but better to be safe then sorry.

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