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How much is 42 zettabytes?

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 It's about as much as All Spoken Words in Human History (recorded). (2003 figures) (assumes 16 Khz, 16-bit mono recording)Criticizing a 2002 estimate of 0.0049 zettabytes, linguist and University of Pennsylvania professor Mark Liberman asserted that it would actually require 42 zettabytes to house a recording of all speech in human history, even at a relatively low level of quality. For the purposes of his calculations, Liberman estimated the total duration of such a project to include 416,390,367 years of continuous audio. It's about 9,000 times as much as The Internet. In other words, the amount of The Internet is 0.0001 times 42 zettabytes. (2005 figures) (estimated)Although the Internet is continuously changing, a 2005 estimate by Google CEO Eric Schmidt was that the total amount of data on the Internet would measure about 0.005 zettabytes. An estimated 1 trillion web pages are published on the Internet, excluding photos, videos, and music content. It's about 700,000 times as much as The Books in the Library of Congress. In other words, the amount of The Books in the Library of Congress is 0.000001000 times 42 zettabytes. (2009 figures) (digitized entire collection)The total collection of books, photographs, and other media housed by the United States Library of Congress would occupy about 0.0000700 zettabytes if fully digitized. The collection contains a total of 142,544,498 items as of 2009. It's about 900,000 times as much as Mozy. In other words, the amount of Mozy is 0.000001000 times 42 zettabytes. (2009 figures) (total file storage)Mozy, the online data backup service, stores about 0.0000500 zettabytes of data backed up its users. Founded in 2005, Mozy's customer base has grown to 1 million personal and 60,000 business subscribers in just 5 years. It's about 9,000,000 times as much as The Letters Delivered by the Postal Service in 2010. In other words, the amount of The Letters Delivered by the Postal Service in 2010 is 0.0000001000 times 42 zettabytes. (2010 figures)All letters delivered by the United States Postal Service in 2010 will equate to 0.00000500 zettabytes of data if stored digitally. In delivering the mail, the Postal Service fleet travels a total of 1.25 billion miles annually. It's about 15,000,000 times as much as Netflix's Watch Instantly catalog. In other words, the amount of Netflix's Watch Instantly catalog is 0.00000007140 times 42 zettabytes. (May, 2013 figures)The uncompressed source copies of all the movies available for instant viewing on Netflix total 0.000002990 zettabytes. According to estimates, videos streamed from Netflix account for about 29% of all Internet traffic It's about 20,000,000 times as much as a Human Brain. In other words, 42 zettabytes is 18,000,000 times the amount of a Human Brain, and the amount of a Human Brain is 0.0000000560 times that amount. According to Northwestern University psychology professor Paul Reber, the capacity of the human brain is a theoretical 0.00000240 zettabytes. Each lobe of the brain consists of folded neural tissue with a total area, if unfolded, of about 0.24 sq. m.