what doesn't get backed up from iphone using itunes?

I am looking to get my iphone replaced under applecare and want to back it up before going to the store.  from what I read, itunes is a more complete backup vs. icloud, but is it 100% complete?  I haven't found a list of what itunes doesn't backup.  Any tips?  I'd like to be able to restore a backup to  new phone and have everything the same as on this phone.  not that it's important, bu using an example of the details I'd like - that it backs up games in progress from 3rd party games that didn't come on the phone initially (as well as restoring the game itself).

am I expecting too much?
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noxchoGlobal Support CoordinatorCommented:
Photos, Videos, Music, Contacts, Messages, ringtones. And also applications if you select them. But they are always in your Apple account (AppStore) so you can download them any time.
The iTunes backup is indeed the most complete you can expect. All your data, all your apps, all your purchases are backed up. The games that are already installed during the backup will definitely come back during restore. The saved games should also be there.

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Kyle SantosQuality AssuranceCommented:
I was in a discussion the other day and we found out SMS texts are also backed up through iCloud and iTunes.
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