What Are RPO and RTO of DRS Disaster Recovery?

Recovery Point Objective (RPO) refers to the difference between the time when a transaction in the current service database is submitted and the time when the transaction is sent to DRS. Generally, the transaction is the latest transaction received by DRS.
RPO measures the difference between the data in the service database and the data in the DRS instance. When RPO equals 0, all the data in the service database has been migrated to the DRS instance.
Recovery Time Objective (RTO) refers to the time difference between the time when a transaction on the current DRS instance is transmitted to the DR instance and the time when the transaction is successfully executed. (This transaction is usually the latest transaction received by DRS.) RTO measures the amount of data being transmitted. When RTO is 0, all transactions on the DRS instance have been completed on the DR database.
Figure 1 RPO and RTO