COW snapshots copy data during the initial data write.Snapshot can be implemented using the copy-on-write (COW) or redirect-on-write (ROW) technology: Like taking a photo, taking a snapshot is to instantaneously make a point-in-time copy of the target application state, enabling zero-backup-window data backup and thereby meeting enterprises' high business continuity and data reliability requirements. Snapshot is one of these data backup technologies. To address these backup issues, numerous data backup and protection technologies, characterized by a short or even zero backup window, have been developed. A backup window is the optimal time to perform a backup without seriously affecting application operations.įacing exponential data growth, enterprises' system administrators must shorten the backup window.For example, if a service could handle an RPO of 20 minutes, it would be able to experience a disaster, lose 20 minutes of data, and still be able to work normally. RPO is a defined period of time in which data can be lost but services can still continue.For example, an RTO of 1 hour means that in case of a disaster, the service data needs to be restored in 1 hour. RTO is the duration of time within which service data must be restored after a disaster.
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