Answer:
Disaster recovery is a set of procedure/plans/actions which are put in place to protect an organization which is facing a disaster. In a technological terms, a government organizations facing cyber attack will follow certain counter measures to recover from cyber disaster. Similarly, in school a disaster recovery can be natural calamity or cyber threat at school's database.
To implement disaster recovery at school or work we must aware everyone with proper procedures and mock drills must be conducted so that people can act swiftly when a disaster occurs and speed up disaster recovery.