An interesting term to look up when considering something like this is the cost to "endow a terabyte": To ensure that it's preserved continually, paid as an up-

An interesting term to look up when considering something like this is the cost to "endow a terabyte": To ensure that it's preserved continually, paid as an up-front cost. IIRC archive.org manages this for somewhere around $2000 per terabyte. There's a lot of interesting research into predicting how changes in drive prices etc will play out and affect this number, that you can find by googleing the term.