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Definition - recovery point objective

n. the age of the data you want the capability to restore in the event of a disaster. If your recovery point objective (RPO) is six hours, you want to be able to restore systems back to the state they were in no longer than six hours ago. To achieve this, you need make backups or other data copies at least every six hours. Any data created or modified inside your RPO will be lost or must be recreated during a recovery. If your RPO is zero, synchronous remote copy solutions are your only choice.

Definition - recovery time objective

n. the duration needed to recover from a disaster, or how long you can afford to be without your systems