I think we could limit the blast radius by working in reasonably sized chunks--like O(10-100MB)--and possibly replicating (which becomes much more attractive wh

I think we could limit the blast radius by working in reasonably sized chunks--like O(10-100MB)--and possibly replicating (which becomes much more attractive when the data set gets a lot smaller). But you're right, it's a good point that redundancy can be a feature.