Disaster Recovery always been associated with Recovery Point Objects and Recovery Time Objects (RPO and RTO).
Recovery Point Object (RPO) is the last point in time that an IT system can be recovered. In this section, the technology used determines how far behind the data or even the loss of a company when there is a disruption to the main system. RPO is used in technologies such as backup, storage replication, data replication and others.
Recovery Time Object (RTO) is related to the time it takes for an IT system to operate normally again when a planned / unplanned interruption occurs. For unplanned interruptions, error detection, data recovery and bringing the application back online are included in RTO.