Dick Eastman has produced an updated version of an article he originally published several years ago.
He says 'A newsletter reader recently questioned the life expectancy of digital files versus paper. I referred him to my earlier article but noticed that it was a bit out of date. I have now rewritten part of the original article and am republishing it today.'
The article can be read on his blog at http://blog.eogn.com/2015/05/08/digital-files-may-last-much-much-longer-than-paper-or-microfilm/