From the Wall Street Journal:
Usually, historians are hard-pressed to find any original source material about those who have shaped our civilization. In the Internet era, scholars of science might have too much. Never have so many people generated so much digital data or been able to lose so much of it so quickly, experts at the San Diego Supercomputer Center say. Computer users world-wide generate enough digital data every 15 minutes to fill the U.S. Library of Congress.