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Brewster Kahle meldet:A snapshot of the World Wide Web is taken every 2 months and donated to the Internet Archive by Alexa Internet. Further, librarians all over the world have helped curate deep and frequent crawls of sites that could be especially important to future researchers historians and scholars.As web pages are changed or deleted every 100 days, on average, having a resource like this is important for the preservation of our emerging cultural heritage.The Wayback Machine is a database that serves thousands of users every day, and currently gets 300 requests per second. The database contains over 1.5 petabytes of data that came from the web (that is 1.5 million gigabytes) which makes it one of the largest databases of any kind.