Continuous Data Protection

CDPcontinuously maintained
Continuous data protection (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves.wikipedia
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Backup

data backupback upbacked up
Continuous data protection (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves.
Continuous Data Protection (CDP) refers to a backup that instantly saves a copy of every change made to the data.

RecoverPoint

EMC RecoverPoint
RecoverPoint is a continuous data protection product offered by Dell EMC which supports asynchronous and synchronous data replication of block-based storage.

InMage

InMage DR-Scout
It markets a product line called Scout that uses continuous data protection (CDP) for backup and replication.

Disaster recovery

recovery time objectiverecovery point objectiverecovery
In an ideal case of continuous data protection, the recovery point objective—"the maximum targeted period in which data (transactions) might be lost from an IT service due to a major incident"—is zero, even though the recovery time objective—"the targeted duration of time and a service level within which a business process must be restored after a disaster (or disruption) in order to avoid unacceptable consequences associated with a break in business continuity"—is not zero.
If RPO is measured in minutes (or even a few hours), then in practice, off-site mirrored backups must be continuously maintained; a daily off-site backup on tape will not suffice.

Cofio Software

AIMstor
The intention of the product is to provide the ability to perform many of the data management functions such as Backup, Archiving, Real Time Replication, Bare Metal Recovery and Continuous Data Protection (True-CDP) under one platform.

Data (computing)

datacomputer datadata representation
Continuous data protection (CDP), also called continuous backup or real-time backup, refers to backup of computer data by automatically saving a copy of every change made to that data, essentially capturing every version of the data that the user saves.

Patent

patentspatent lawpatented
The technique was patented by British entrepreneur Pete Malcolm in 1989 as "a backup system in which a copy [editor's emphasis] of every change made to a storage medium is recorded as the change occurs [editor's emphasis]."

United Kingdom

BritishUKBritain
The technique was patented by British entrepreneur Pete Malcolm in 1989 as "a backup system in which a copy [editor's emphasis] of every change made to a storage medium is recorded as the change occurs [editor's emphasis]."

Asynchronous transfer mode

ATMVirtual Path IdentifierVirtual Channel Identifier
When data is written to disk, it is also asynchronously written to a second location, either another computer over the network or an appliance.

Virtual machine

virtual machinesVMvirtual server
Since true CDP "backup write operations are executed at the level of the basic input/output system (BIOS) of the microcomputer in such a manner that normal use of the computer is unaffected", true CDP backup must in practice be run in conjunction with a virtual machine or equivalent —ruling it out for ordinary personal backup applications.

Snapshot (computer storage)

snapshotssnapshotsnapshotting
When the interval is shorter than one hour, "near-CDP" solutions—for example Arq Backup —are typically based on periodic "snapshots"; "to avoid downtime, high-availability systems may instead perform the backup on ... a read-only copy of the data set frozen at a point in time—and allow applications to continue writing to their data".

Granularity

granularfine-grainedcoarse-grained
There is debate in the industry as to whether the granularity of backup must be "every write" to be CDP, or whether a "near-CDP" solution that captures the data every few minutes is good enough.

Storage Networking Industry Association

SNIASNIA Conformance Testing ProgramSNIA Dictionary
The Storage Networking Industry Association (SNIA) uses the "every write" definition.

RAID

redundant array of independent disksRAID arrayRedundant Array of Inexpensive Disks
Continuous data protection differs from RAID, replication, or mirroring in that these technologies only protect one copy of the data (the most recent).

Replication (computing)

replicationdata replicationreplicated
Continuous data protection differs from RAID, replication, or mirroring in that these technologies only protect one copy of the data (the most recent).

Disk mirroring

mirroringmirrordisk mirror
Continuous data protection differs from RAID, replication, or mirroring in that these technologies only protect one copy of the data (the most recent).

Journaling file system

journalingjournaljournaled
They could be recovered through other means, such as journaling.

Byte

bytesBTB
Most continuous data protection solutions save byte or block-level differences rather than file-level differences.

Multimedia

multi-mediamultimedia artistmultimedia art
When real-time edits—especially in multimedia and CAD design environments—are backed up offsite over the upstream channel of the installation's broadband network, network bandwidth throttling may be needed to reduce the impact of true CDP.

Computer-aided design

CADcomputer aided designCAD software
When real-time edits—especially in multimedia and CAD design environments—are backed up offsite over the upstream channel of the installation's broadband network, network bandwidth throttling may be needed to reduce the impact of true CDP.

Comparison of online backup services

List of online backup servicesonline backup servicesOnline backup providers