I had a problem in my mind is that I have purchased a iPhone 3G few weeks ago and I had a problem with my PC also and now I am synchronizing the iPhone 3G with my PC. This was working well. And I finally got my PC well. But now I am synchronizing the iPhone with my computer it shows the error message that "iTunes cannot back up the iPhone because an unknown error occured (-20)" and I am not able to find anything on the internet. So if anybody having the solutioin of this problem then please helps me in solving the problem.
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