When data disappears by Kari Kraus, Assistant Professor, College of Information Studies and the English Department, University of Maryland
http://www.diigo.com/annotated/428bd5721fec32cb214e1f38e0cd8beb
We generate over 1.8 zettabytes of digital information a year. By some estimates, that’s nearly 30 million times the amount of information contained in all the books ever published. Even if we had perfectly stable storage, could we ever have enough to preserve everything?
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John Quiggin the economist also picked up on that article. His personal take is interesting:
http://johnquiggin.com/2011/08/08/does-digital-data-disappear/