For five years now, a Ponemon Institute annual report has tried to put a number on the cost of data breaches. It creates benchmarks for direct costs such as regulatory fines and the cost of notifying customers, alongside estimates of indirect costs such as customer churn and lost business. In 2013, Ponemon pegged the cost of a data breach at $136 per lost record on average across the globe. Ponemon estimated the cost in the U.S. at $188 per record, and $277 per record when the breach came at the hands of malicious and criminal attacks such as outside hacking or insider theft.
via How To Cushion The Impact Of A Data Breach — Dark Reading.
Interesting numbers in the article with a strong emphasis on planning.