We have automated backups, and should even those somehow find themselves compromised (which is a completely different concern from getting DDoSed), there are archive.org backups of a decent percentage of LW posts, which would be much easier to restore than paper copies.
There is also GreaterWrong, which I believe caches everything rather than passing through live, so it would be able to restore almost all publicly-visible content, in theory.
We have automated backups, and should even those somehow find themselves compromised (which is a completely different concern from getting DDoSed), there are archive.org backups of a decent percentage of LW posts, which would be much easier to restore than paper copies.
There is also GreaterWrong, which I believe caches everything rather than passing through live, so it would be able to restore almost all publicly-visible content, in theory.