I don't have any of my contacts synced from my iPhone. My calendar and apps are synced but I can control those all separately on the iCloud's settings.
Beta might not recognize all this contacts, emails, apps ect.....but it counts as well.
I have checked all the other applications and they each have their own size below it under the iCloud settings. None of them even come close to that size that it's showing under the camera roll. Its kind of odd that it shows that much and there is nothing showing in the camera roll.