Will I lose everything if I restore my iPhone?

My iPhone is jailbroken and it messes up and annoys me a lot. And iOS 7 is coming soon, so I want to restore it. I've seen people say everything will be okay, and some say you will lose everything. I regularly sync my phone with my computer. If there's something special to do to save everything, what is it? I just want to make sure I don't lose my pictures and contacts and all that good stuff.

Just backup to icloud. Go to http://www.icloud.com/...icloud.com and you can sign on and see what you have backed up, etc. Its pretty slick and many don't know you can view it from the URL.

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