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How much is 2.50 petabytes?

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It's about three times as much as The Google database.
In other words, the amount of The Google database is 0.330 times 2.50 petabytes.
(2006 figures) (web crawler data; compressed)
As of 2006, the Google search engine database contained 0.830 petabytes 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 three times as much as Facebook's Photo Storage.
In other words, the amount of Facebook's Photo Storage is 0.30 times 2.50 petabytes.
(2008 figures) (total storage)
Facebook, the popular social networking site, hosts about 1 petabyte (pB) of photos uploaded by its users as of 2008. Facebook users upload more than 0.002 petabytes of new photos to this collection every day.
It's about four times as much as The Ancestry.com's Census Records.
In other words, the amount of The Ancestry.com's Census Records is 0.30 times 2.50 petabytes.
(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 0.60 petabytes of data. According to company estimates, the project took 6.6 million hours (750 person-years) to complete.
It's about five times as much as The YouTube's video database.
In other words, 2.50 petabytes is 4.840 times the amount of The YouTube's video database, and the amount of The YouTube's video database is 0.2070 times that amount.
(2008 figures) (video data only)
YouTube's collection of user-generated and commercially-produced videos measures about 530 petabytes (pB) in total data volume. Every minute, an average of 35 hours of new video content is uploaded to YouTube.
It's about five-and-a-half times as much as a Walmart's Mainframe.
In other words, the amount of a Walmart's Mainframe is 0.180 times 2.50 petabytes.
(a.k.a. Wal-Mart, a.k.a. Wal-Mart Stores, Inc) (2004 figures)
As of 2004, Walmart had accumulated nearly 460 terabytes of data about its customers, inventory, products, and sales. According to some estimates, the total area of all Walmart stores in the United States measures 64,000,000 sq. m.
It's about ten times as much as Pandora.
In other words, the amount of Pandora is 0.10 times 2.50 petabytes.
(a.k.a. Pandora Radio) (2011 figures)
Pandora, the online radio and song recommendation service, stores 0.240 petabytes of music. Its music recommendation service categorizes each song in its library using 400 attributes and 2,000 attribute combinations.
It's about seventeen times as much as The IRS Compliance Database.
In other words, the amount of The IRS Compliance Database is 0.059 times 2.50 petabytes.
(a.k.a. Internal Revenue Service) (2006 figures)
The United States Internal Revenue Service's compliance database holds more than 0.150 petabytes of data on tax returns and other records. Each year of tax records occupies between 0.017 petabytes.