There are two main technical indicators for disaster recovery, RTO is the recovery time objective,...

RTO is infinitely close to 0. Even if synchronous replication is used, the business still needs some time,

The smaller the RTO value, the less data is lost

The smaller the RPO value, the smaller the service interruption time.

In theory, RPO can be equal to 0. When disaster recovery or backup uses synchronous replication, the same

Step data, RPO can be achieved equal to 0.