Iphone 4 doesn't back up

Hi can anyone help me? my iphone 4 won't back up when I connect it to my mac, it just starts syncing and doesn't back up at all. I've even deleted the past back ups, but it still won't back up.

Close iTunes. Open terminal & type the following command or copy & paste:
defaults write com.apple.iTunes DeviceBackupsDisabled -bool false
defaults write com.apple.iTunes AutomaticDeviceBackupsDisabled -bool false
Hit enter.

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