Disaster recovery (DR) is about preparing for and recovering from a disaster. Any event that has a negative impact on a company’s business continuity or finances could be termed a disaster. This includes hardware or software failure, a network outage, a power outage, physical damage to a building like fire or flooding, human error, or some other significant event.
To minimize the impact of a disaster, companies invest time and resources to plan and prepare, to train employees, and to document and update processes. The amount of investment for DR planning for a particular system can vary dramatically depending on the cost of a potential outage. Companies that have traditional physical environments typicallymust duplicate their infrastructure to ensure the availability of spare capacity in the event of a disaster. The infrastructure needs to be procured, installed, and maintained so that it is ready to supportthe anticipated capacity requirements. During normal operations,the infrastructure typically is under-utilized or over-provisioned.
Key factors for Disaster Planning
Disaster Recovery RTO RPO DefinationRecovery Time Objective (RTO) – The time it takes after a disruption to restore a business process to its service level, as defined by the operational level agreement (OLA) for e.g. if the RTO is 1 hour and disaster occurs @ 12:00 p.m (noon), then the DR process should restore the systems to an acceptable service level within an hour i.e. by 1:00 p.m
Recovery Point Objective (RPO) – The acceptable amount of data loss measured in time before the disaster occurs. for e.g., if a disaster occurs at 12:00 p.m (noon) and the RPO is one hour, the system should recover all data that was in the system before 11:00 a.m.