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continuous data protection
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. It allows the user or administrator to restore data to any point in time.〔http://www.eweek.com/c/a/Data-Storage/How-to-Use-Continuous-Data-Protection-to-Improve-Backup-Disaster-Recovery/〕 The technique was patented by British entrepreneur Pete Malcolm in 1989.〔US Patent 5086502 (“A method of operating a data processing system” ) filed Nov 13, 1989.〕
CDP runs as a service that captures changes to data to a separate storage location. There are multiple methods for capturing the continuous changes involving different technologies that serve different needs. CDP-based solutions can provide fine granularities of restorable objects ranging from crash-consistent images to logical objects such as files, mail boxes, messages, and database files and logs.
== Differences from traditional backup ==
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. Traditional backups only restore data from the time the backup was made. Continuous data protection has no backup schedules. When data is written to disk, it is also asynchronously written to a second location, usually another computer over the network. This introduces some overhead to disk-write operations but eliminates the need for scheduled backups.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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