Saw a reference to Lockss in the recent Economist tech review. Its basic mission:

“let us save what remains:
not by vaults and locks which fence them from the public eye
and use in consigning them to the waste of time,
but by such a multiplication of copies,
as shall place them beyond the reach of accident.” — Thomas Jefferson

All well and good for libraries, but I need this for all my personal stuff too. I wish I had a dead simple way for instance of replicating all my digital photos to 3-4 different places, so that I was never at risk of losing them.