It's about eight 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 0.1 times 494.9 petabytes.(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 70 petabytes if fully digitized. The collection contains a total of 142,544,498 items as of 2009.
It's about ten times as much as Mozy.
In other words, the amount of Mozy is 0.1 times 494.9 petabytes.(2009 figures) (total file storage)
It's about one-tenth as much as The Internet.
In other words, the amount of The Internet is 10 times 494.9 petabytes.(2005 figures) (estimated)
It's about 100 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 0.01 times 494.9 petabytes.(2010 figures)
It's about 150 times as much as Netflix's Watch Instantly catalog.
In other words, 494.9 petabytes is 158 times the amount of Netflix's Watch Instantly catalog, and the amount of Netflix's Watch Instantly catalog is 0.00633 times that amount.(May, 2013 figures)
It's about 200 times as much as a Human Brain.
In other words, the amount of a Human Brain is 0.005 times 494.9 petabytes.
It's about 200 times as much as The US Census Bureau.
In other words, the amount of The US Census Bureau is 0.005 times 494.9 petabytes.(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 2.5 petabytes (pB) 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.