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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. Such "near-CDP"-short for near-continuous data protection-schemes are not universally recognized as true continuous data protection, as they do not provide the ability to restore to any point in time. Some solutions marketed as continuous data protection may only allow restores at fixed intervals such as 15 minutes or one hour or 24 hours, because they automatically take incremental backups at those intervals. It is therefore discussed in the "Enterprise client-server backup" article, rather than in the " Backup" article. 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. That's certainly a higher level of protection than tape-based or disk-based nightly backups and may be all you need." Because "near-CDP does this at pre-set time intervals", it is essentially incremental backup initiated-separately for each source machine-by timer instead of script. For example, snapshots can provide a reasonable near-CDP-level of protection for file shares, letting users directly access data on the file share at regular intervals-say, every half hour or 15 minutes. But 'near CDP' technologies can deliver enough protection for many companies with less complexity and cost. This introduces some overhead to disk-write operations but eliminates the need for scheduled backups.Īllowing restoring data to any point in time, "CDP is the gold standard-the most comprehensive and advanced data protection. When data is written to disk, it is also asynchronously written to a second location, either another computer over the network or an appliance. True continuous data protection, in contrast to "snapshots", has no backup schedules. Traditional backups only restore data from the time the backup was made.
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True continuous data protection is different from traditional backup in that it is not necessary to specify the point in time to recover from until ready to restore.
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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. The technique was patented by British entrepreneur Pete Malcolm in 1989 as "a backup system in which a copy of every change made to a storage medium is recorded as the change occurs. In its true form it allows the user or administrator to restore data to any point in time. 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.