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The NSA's Utah Data Center will be able to handle and process five zettabytes of data, according to William Binney, a former NSA technical director turned whistleblower.

http://www.npr.org/2013/06/10/190160772/amid-data-controvers...

However, from the same article:

Despite its capacity, the Utah center does not satisfy NSA's data demands. Last month, the agency broke ground on its next data farm at its headquarters at Ft. Meade, Md. But that facility will be only two-thirds the size of the mega-complex in Utah.