Karl Jones: /* External links */

2016-04-21T11:55:31Z

‎External links

Karl Jones at 10:20, 7 February 2016

2016-02-07T10:20:30Z

Karl Jones: Created page with "In information technology, a '''backup''', or the process of '''backing up''', refers to the copying and archiving of computer data so it may..."

2015-09-09T20:53:46Z

Created page with "In information technology, a '''backup''', or the process of '''backing up''', refers to the copying and archiving of computer data so it may..."

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In [[information technology]], a '''backup''', or the process of '''backing up''', refers to the [[copying]] and [[archiving]] of [[Data (computing)|computer data]] so it may be used to [[restore]] the original after a [[data loss event]].

(TO DO: expand, organize, cross-reference, illustrate.)

== Purposes ==

Backups have two distinct purposes.

* Recovering from data loss
* Recovering earlier versions

== Recovering from data loss ==

The primary purpose is recovering from [[data loss]], be it by [[data deletion]] or [[corruption]].

Data loss can be a common experience of computer users. A 2008 survey found that 66% of respondents had lost files on their home PC.

== Recovering earlier versions ==

The secondary purpose of backups is to recover data from an earlier time, according to a user-defined data retention policy, typically configured within a backup application for how long copies of data are required.

See [[Revision system]].

== Backups alone not disaster recovery ==

Though backups popularly represent a simple form of [[disaster recovery]], and should be part of a [[disaster recovery plan]], by themselves, backups should not alone be considered disaster recovery.

One reason for this is that not all backup systems or backup applications are able to reconstitute a computer system or other complex configurations such as a computer cluster, active directory servers, or a database server, by restoring only data from a backup.

== Data storage requirements ==

Since a backup system contains at least one copy of all data worth saving, the [[data storage requirements]] can be significant.

Organizing this storage space and managing the backup process can be a complicated undertaking.

A [[data repository model]] can be used to provide structure to the storage.

There are many different types of data storage devices that are useful for making backups.

There are also many different ways in which these devices can be arranged to provide [[geographic redundancy]], [[data security]], and [[software portability]].

== Preparing data for backup ==

Before data are sent to their storage locations, they are selected, extracted, and manipulated.

== Backup techniques ==

Many different techniques have been developed to optimize the backup procedure.

These include optimizations for dealing with open files and live data sources as well as compression, encryption, and de-duplication, among others.

Every backup scheme should include dry runs that validate the reliability of the data being backed up.

== Limitations and human factors ==

It is important to recognize the limitations and [[human factors]] involved in any backup scheme.

== Verb versus noun ==

The verb form is to back up in two words, whereas the noun is backup.

== See also ==

* [[Computer]]
* [[Information technology]]
* [[Revision control]]
* [[Software portability]]

== External links ==

* [https://en.wikipedia.org/wiki/Backup Backup] @ Wikipedia

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	In [[information technology]], a '''backup''', or the process of '''backing up''', refers to the [[copying]] and [[archiving]] of [[Data (computing)\|computer data]] so it may be used to [[restore]] the original after a [[data loss event]].		In [[information technology]], a '''backup''', or the process of '''backing up''', refers to the [[copying]] and [[archiving]] of [[Data (computing)\|computer data]] so it may be used to [[restore]] the original after a [[data loss event]].
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−	~~(TO DO: expand, organize, cross-reference, illustrate.)~~

	== Purposes ==		== Purposes ==

Backup - Revision history

Karl Jones: /* External links */

Karl Jones at 10:20, 7 February 2016

Karl Jones: Created page with "In information technology, a '''backup''', or the process of '''backing up''', refers to the copying and archiving of computer data so it may..."