It's about 20,000,000 times as much as The US Census Bureau.
In other words, 42 zettabytes is 18,000,000 times the amount of The US Census Bureau, and the amount of The US Census Bureau is 0.0000000560 times that amount.(a.k.a. United States Census Bureau, a.k.a. Bureau of the Census) (2010 figures) (total active data)
The United States Census Bureau administers 0.00000240 zettabytes of demographic and population data gathered through the decennial census and other surveys. The Census Bureau makes the results of each census public 72 years after they are gathered.
It's about 20,000,000 times as much as an Imgur's Monthly Bandwidth.
In other words, 42 zettabytes is 20,900,000 times the amount of an Imgur's Monthly Bandwidth, and the amount of an Imgur's Monthly Bandwidth is 0.00000004780 times that amount.(Jan-Feb, 2012 figures)
Imgur, the free online image hosting service, used a total of 0.000002010 zettabytes in bandwidth between January and February, 2012. The site has served up over 15 billion images in that time.
It's about 35,000,000 times as much as World of Warcraft.
In other words, the amount of World of Warcraft is 0.0000000280 times 42 zettabytes.(a.k.a. WoW) (2009 figures) (total storage for Blizzard Entertainment)
World of Warcraft, the popular massively multiplayer online role-playing game (MMORPG), uses 0.00000120 zettabytes of data for its operations. The game's development required about 5 years and included the enhancement of a proprietary 3D graphics engine developed for the prequel of the game.
It's about 50,000,000 times as much as a Avatar.
In other words, the amount of a Avatar is 0.0000000200 times 42 zettabytes.(a.k.a. James Cameron's Avatar, a.k.a. Avatar: An IMAX 3D experience) (production rendering data)
Using a combination of breakthrough techniques that ultimately made it the most expensive movie ever produced, the film Avatar required 0.000001000 zettabytes of storage space for its computer rendering. According to some sources, each frame of the 166-minute movie took an average of 47 person-hours to complete.
It's about 50,000,000 times as much as Facebook's Photo Storage.
In other words, the amount of Facebook's Photo Storage is 0.0000000200 times 42 zettabytes.(2008 figures) (total storage)
Facebook, the popular social networking site, hosts about 0.000001000 zettabytes of photos uploaded by its users as of 2008. Facebook users upload more than 0.00000000200 zettabytes of new photos to this collection every day.
It's about 55,000,000 times as much as The Google database.
In other words, the amount of The Google database is 0.0000000190 times 42 zettabytes.(2006 figures) (web crawler data; compressed)
As of 2006, the Google search engine database contained 0.000000790 zettabytes of compressed data about the web pages it had indexed while crawling the web. Each day, Google processes over one billion search requests.
It's about 80,000,000 times as much as The Ancestry.com's Census Records.
In other words, the amount of The Ancestry.com's Census Records is 0.00000001000 times 42 zettabytes.(2006 figures) (1790 to 1930 records only)
Updated in 2006 through a one-of-a-kind project, the genealogical research site Ancestry.com added 540 million names from records in the 1790 to 1930 US Census, capturing a total of 0.000000600 zettabytes of data. According to company estimates, the project took 6.6 million hours (750 person-years) to complete.