Yea, that's a valid point. I'm pretty sure some could handle it, but many peers may not be able to. Using Usenet for mass archives would have to be done gradually. "more than 25 petabytes of Usenet messages on the Giganews servers." ... "Giganews is 50 percent bigger today than at this point last year and we continue to add servers with this kind of growth in mind." [1]

I just think it's an under utilized medium for this sort of media conservation.

1 - http://www.giganews.com/blog/2014/01/giganews-reaches-2000-d...