More Tips for Averting Disaster

Develop relationships within the community. Focus especially on the health and safety organizations with which you'd need to communicate in an emergency.
Conduct training drills periodically. Spend a weekend day ensuring that things will happen as planned.
Inventory your infrastructure. Be sure to include photos, notes and detailed instructions.
Partner with other schools in your state, near and far. You can develop disaster recovery plans together and help each other if one of the partner schools faces an emergency.
Don't just think centrally. Train staff to regularly back up their own data so they have access to their most valuable information in an emergency.
Know your priorities. What information, software, documentation and equipment are necessary? How much would it cost to rebuild in an emergency?
Listen to your constituents. Is restoring e-mail the top priority for teachers, students and parents, or is the payroll system more important?