ABSTRACT
How point-in-time copy, continuous data protection, and scheduled-image data protection work
What replication strategies do for high availability and low data loss
How the various mirroring technologies-synchronous remote mirroring, asynchronous remote mirroring, and semisynchronous remote mirroring-work
How dated replication technologies differ from mirrored replication technologies
Recall that one of the basic objectives of data protection is data availability. Ensuring data availability is the goal of some data protection technologies. The purpose of these data protection technologies is to deliver low or no data loss, that is, a recovery point objective (RPO) of little or no data loss; and high availability in terms of only seconds or minutes per year of unplanned downtime, that is, a recovery time objective (RTO) where little or no downtime occurs. These technologies work by first making a copy or replica of the original data. A copy or replica is an imitation or reproduction of an original.
