The 3-2-1 rule can aid in the backup process. The scheme determines how and when each piece of removable storage is used for a backup operation and how long it is retained once it has backup data stored on it. The backup data needs to be stored, requiring a backup rotation scheme, which is a system of backing up data to computer media that limits the number of backups of different dates retained separately, by appropriate re-use of the data storage media by overwriting of backups no longer needed. The repository could be as simple as a list of all backup media (DVDs, etc.) and the dates produced, or could include a computerized index, catalog, or relational database. 3 Manipulation of data and dataset optimizationĪ backup strategy requires an information repository, 'a secondary storage space for data' that aggregates backups of data 'sources'.There are limitations and human factors involved in any backup scheme. Backup schemes may include dry runs that validate the reliability of the data being backed up. Additional techniques apply to enterprise client-server backup. The process can include methods for dealing with live data, including open files, as well as compression, encryption, and de-duplication.

There are also different ways these devices can be arranged to provide geographic dispersion, data security, and portability.ĭata is selected, extracted, and manipulated for storage. There are different types of data storage devices used for copying backups of data that is already in secondary storage onto archive files. An information repository model may be used to provide structure to this storage. The data storage requirements can be large. Ī backup system contains at least one copy of all data considered worth saving. Backups provide a simple form of disaster recovery however not all backup systems are able to reconstitute a computer system or other complex configuration such as a computer cluster, active directory server, or database server. Backups can be used to recover data after its loss from data deletion or corruption, or to recover data from an earlier time. The verb form, referring to the process of doing so, is ' back up', whereas the noun and adjective form is ' backup'. In information technology, a backup, or data backup is a copy of computer data taken and stored elsewhere so that it may be used to restore the original after a data loss event. For other uses, see Backup (disambiguation). This article is about duplicate data in computer systems for data recovery.

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