September 11, 2001, Terrorist Incidents Lessons Learned: New
Approaches Needed for Disaster Recovery and Business Continuity
Planning
"Survivability" is a different way of looking at normal disaster
recovery plans.
Domain Name System: Eliminating Single Points of Failure
This concentrates on the provisioning of authoritative DNS servers,
but don't forget about the other half of DNS, resolvers.
http://www.nipc.gov/publications/highlights/2001/highlight-01-11.pdf