Will I lose my unjailbroken apps if I upgrade to IOS7 from Jailbreak?

So I've decided to back up all my music and all my photos because I want to updated to IOS 7. The only problem I have is before I jailbroke my IOS6 Iphone 5 I got a free app (legally, no jailbreak yet) called Foxtube. I have like 300 videos there, all music videos and other stuff I enjoy watching and it would be a shame if I lost them. I'm asking this so that I know if I should take the pain of backing up every individual video from Foxtube to my camera roll, and then backing it up again before jailbreaking so at least I have a copy of them. I'm running an untethered jailbreak on IOS 6.0.1, by the way.

Yes. Because since you jailbroke it will force a total restore.ofcourse you can restore from backup but iOS is completely different that iOS 6 and results are unknown

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