Updating my iPhone 4 to iOS5 I've got error (-402653077)

While updating my iPhone 4 to iOS I've got this error message:
An error occurred while backing up this iPhone (-402653077). Would you like to continue to update this iPhone?
What shall I do? Cancel the update and try again?
Please let me know,
Andrea

One more thing: My concern now is, if I choose cancel will the update abort and nothing will happen to my iPhone contents or will I incurr in some troubles/dataloss?
Does anybody has a clue?

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