Problem updating iphone to iOS5

I am trying to update my iPhone to the latest version 5 from 4.3.5 but get the following error
"An error occurred while backing up this iPhone (-43).  Would you like to continue to update this iPhone? Continuing will result in loss of all contents on this phone"
I have backed it up but the message is making me very nervous as I cant tell exactly what has been backed up and I don't want to do a total restore
The update worked fine on my iPad and they were both last updated at the same time
Please can anyone help?

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