- National Security Agency's Surveillance Data Could Fill Two States by 2015 - The NSA wants to store yottabytes of data, and one yottabyte comes to 1,000,000,000,000,000 GB. http://www.popsci.com/technology/article/2009-11/national-security-agencys-surveillance-data-could-fill-two-states-2015 6 comments science