Saving so far...

Then, there's the cost of capital, as well as the opportunity cost had those precious dollars been spent on storage rather than invested in other ventures. Using only a 10% internal rate of return (IRR) on capital, $16 to 24 million (in 1995 dollars) has been saved per GB of total storage in the 30 years from 1963 through 1992. This is a more realistic indication of the economic benefits of our date storage decisions.