backing up your data is very important. if it is taking way to long to backup, then theres a problem with your phone. you need to restore to fix it, or find the cause of the problem. happened to me.
i did a restore as new when i went to 3.1.3. my photos and video i copy over manually to my PC. everything else like email i can just sync if i restore as new. including data from apps
You're not doing it right.
Don't cancell on slide to unlock on the iPhone.
On iTunes it should have a little X where it displays backing up johns iPhone for example.