Near-continuous data protection (near CDP) is a general term for backup and recovery products that take backup snapshots at set intervals. The term evolved from a need to differentiate those vendor products that take snapshots on a pre-determined schedule from ones that take snapshots whenever new data is written (true CDP).
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Both near CDP and true CDP support instantaneous recovery, meaning that if the primary image is damaged, a recovery image can be mounted immediately. The difference between near CDP and true CDP is the recovery point objective (RPO) they offer.
A near CDP product is an acceptable backup option when the potential loss of a small amount of data can be tolerated. Near CDP products are usually limited to a specific number of snapshots that the application or storage system can create. Once that limit is met, earlier snapshots are overwritten.
See also: backup and recovery glossary
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