The drawback Al pointed out - digital media lifetime -
can be considered as
 a problem. Digital data storage needs a constant effort to keep the data. 
One list I am on where this issue never comes up is the IBM-MAIN
(mainframe) list. Why? Because these people figured out all this stuff
back in the 60s.
Why is this digital media issue such a big deal? Maybe we should learn
 from the people that have done all this stuff before,
now on their 
fifth (I think) generation of offline storage, almost never missing a
beat.
--
Will