Check out the final comment...

http://www.shns.com/shns/g_index2.cfm?action=detail&pk=ARCHIVE-12-11-05

Another problem is authenticating digital documents. A paper record can be 
stamped with the date, and future researchers can verify its age by 
characteristics such as paper and type.
That's no easy feat with an undated digital document. And it's hard to know 
whether an electronic record was altered after it was first created.
....
But digital archiving is "more costly than most people think," said James 
Jacobs, until recently a government information librarian at the University 
of California, San Diego.
....
"This is the unfunded mandate from hell," said Greenstein, referring to 
programs mandated by the state without accompanying money. "Where's the 
check?"
....
"It's something our legislators aren't really thinking about, and that's 
kind of alarming," Jacobs said.
....
As it stands, these solutions are theoretical. Today, the only surefire way 
to guarantee that a document will be available in the future is decidedly 
low-tech.
"If we absolutely, positively want to ensure that we have the item in 150 
years," Jewell said, "our best preservation is print."

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