Why won't itunes let me backup my Iphone?

Every time I plug in my iphone to my computer and itunes comes up I get this message

"Itunes could not back up the iphone because the backup was corrupt or not compatible with the Iphone."

What does this mean? And why can't I backup my iphone?

should I not update to iOS 6 before I have my phone backed up because I'm afraid I'll lose everything.

Try backing up your iPhone using this program
http://www.wideanglesoftware.com/touchcopy/

  • Why won't the new iTunes let me transfer my music to my iPhone? I have the most updated iTunes and iPhone 5 software. I use to be able to click and drag music from my iTunes to my iPhone on the sidebar, but i can't do that anymore and i can't figure out how to transfer my music.has anybody figure it out?
  • Why won't iTunes let my iPhone go into iTunes? My brother put a password on my iPhone, and he forgot it. I, stupidly, tried a whole bunch of passwords to see if I could get it, and not my phone is disabled. I tried connecting it to iTunes to get it undisabled so I can restore my phone, but it keeps saying I need to put in the password in order for me do get onto iTunes. This happen to anybody else? Can somebody Please help me!
  • Why won't itunes let me sync with my iphone? When I plug in itunes and my phone, i get this error message: "Itune was unable to load data class information from Sync Services. Reconnect or try again." I try many times. After this error message pops up, itunes freezes and i have to go to windows task manager to close it. How do i fix it so i can sync again?
  • Why won't itunes let me sync my iphone? I just added my iphone to this computer and authorized it and everything. It is authorized on 4/5 computers. I have added one song to my list and when i go on 'file' then 'devices' then 'sync' and other options i'm unable to click on it, and its a lighter colour? Why is it like that and how do i change it so i can sync my iphone and its music?