Does updating my IPhone 4 to version 5.11 delete my photos, apps, or music?

Ok so I bought an Iphone 4 almost a year ago and haven't updated it at all. My friends say its a good idea to but i don't want to risk my data. I'm with bell if its important. I also don't want to go over my monthly usage. So when I'm on Itunes I always back it up and transfer my data. It tells me it couldn't transfer some things. Then when I go to click update, it says there are some things on your Iphone that havecould not been transferred, do you want to continue? So I click continue and it says updating will delete all my apps and to preserve them, I have to update on the computer where I sync them. What is all this? I want my update but I don't want to lose any data! Please and thank you for helping.

You can sync all your stuff before upgrading. Use ICloud to sync all your apps, photos, and videos

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