Updating google search appliance
If the snapshots are replicated, this allows you to leave very few snapshots on the primary system with all previous snapshots stored on the secondary system.
This has the effect of minimizing the performance impact of the snapshots on the primary system while maintaining historical versions for operational recovery.
The Storage Networking Industry Association (SNIA), a leading storage vendors' trade organization, offers its own definition of CDP: "Continuous data protection [CDP] is a methodology that continuously captures or tracks data modifications and stores changes independent of the primary data, enabling recovery points from any point in the past." A true CDP system captures every change or new piece of data as soon as it's committed to disk and immediately replicates that change to another system.
Typically, copy-on-write snapshots are only used to create a stable image as a source for another backup system.
This can be a traditional backup system that copies the snapshotted volume to a backup system or a more advanced system that replicates the snapshot to another storage system.
Snapshot backup software can be a cheaper and more trouble-free way to manage your data backup process vs. Also called near-continuous data protection (or near-CDP), snapshot backups are good if you need recovery point objectives (RPOs) measured in seconds or minutes.
Due to the features of most modern backup software – which include snapshot management, DR elements, cloud support, VM protection – backups can do so much more than simply restoring data in the event of a storage or server failure.
The most common type of snapshot is the copy-on-write snapshot.