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You can view and copy the source of this page:

((Short description|Filename extension used for backup copies))
((mi|
 ((lead extra info|date=August 2022))
 ((more citations needed|date=August 2022))
))
In computing, "'''.bak'''" is a [[filename extension]] commonly used to signify a [[backup|backup copy]] of a [[computer file|file]].

When a program is about to overwrite an existing file (for example, when the user saves the document they are working on), the program may first make a copy of the existing file, with <code>.bak</code> appended to the filename. This common <code>.bak</code> naming scheme makes it possible to retrieve the original contents of the file in case of a failed write that corrupts the file, which could be caused by an [[Crash (computing)|operating system crash]], power outage, or disk space exhaustion.

Without the backup file, an unsuccessful write event may truncate a file, meaning it cuts off the file at a position, or leaves a blank file. In practice, this could cause a written document to become incomplete or get lost, a multimedia project file (e.g. from a video editor) to become unparseable, and user preferences being reset to default.

In a similar manner, a user may also manually make a copy of the file before the change and append <code>.bak</code> to the filename, or alternatively save revisions into separate files, to facilitate reverting to an earlier revision in case of an error.

Other naming schemes are also in widespread use: <code>file~</code>, <code>file.orig</code>, <code>file.old</code>, and appended time stamps.

Database Applications like [[FoxPro 2|FoxPro]] and SQL Server use <code>.bak</code> files to back up their databases and other applications, like [[XML shell]], create <code>.bak</code> files in their [[auto-save|autosave]] process.<ref>((cite web|title=What Is a BAK File?|url=http://www.wisegeek.com/what-is-a-bak-file.htm|work=www.wisegeek.com|publisher=M. Haskins|access-date=12 March 2013|archive-date=7 May 2013|archive-url=https://web.archive.org/web/20130507020815/http://www.wisegeek.com/what-is-a-bak-file.htm|url-status=live))</ref> They do not get automatically deleted, so they need to be manually deleted after the process using it is stopped.

== Example applications using .bak files ==
((trivia section|date=August 2022))
This is a partial list of applications that generate <code>.bak</code> files (in some cases as an optional configuration setting):
<div style="column-width:100px">
* [[Apophysis (software)|Apophysis7X]]
* [[Alteryx]]
* [[Aspell]]
* [[Audacity (audio editor)|Audacity]]
* [[AutoCAD]]
* [[fluidsim]]
* [[BlueGriffon]]
* [[Captivate]]
* [[Cubase]]
* [[Dassault Systèmes|DraftSight]]
* [[DrRacket]]
* ''[[Exiled Kingdoms rpg]]'' 
* [[Family Tree Maker]]
* [[Finale Notepad]]
* [[FoxPro]]
* [[FormZ]]
* [[Google Chrome]]
* ''[[Grand Theft Auto V]]''
* [[HxD]]
* [[HyperCam]]
* [[JavaFX|JavaFX Scene Builder]]
* [[Lazarus (IDE)|Lazarus]]
* [[LMMS]]
* [[MATLAB]]
* [[Minitab]]
* [[Mozilla Firefox]]
* [[Mupen64]]
* [[Notepad++]]
* [[NUPS]]
* [[Opera (browser)|Opera]]
* [[Outlook Express]]
* [[Password Safe]] (.ibak)
* [[Photoshop]]
* [[PScad]]
* [[Free Pascal]]
* [[Rhinoceros 3D]]
* [[Sony Vegas]]
* [[Microsoft SQL Server|SQL Server]]
* [[SCIA Engineer]]
* [[Steinberg Cubase]]
* [[Starbound]]
* [[TeamViewer]] Manager
* [[Terraria]]
* [[Texmaker]]
* [[TextCrawler]]
* [[Turing]]
* [[Turbo C++]]
* [[UltraEdit]]
* [[Agilent VEE|VEE]]
* [[WhatsApp]]
* [[Windows]] (BOOTSECT.BAK)
* [[WinMerge]]
* [[Microsoft Word|Word]]
* [[Zmodeler]]
* [[OpenMPT]]
</div>

== External links ==
* [http://www.webopedia.com/TERM/B/BAK_file.html BAK file]
* ((cite web|url=http://malektips.com/file_extensions_0016.html |title=BAK or BK File Format|archiveurl=https://web.archive.org/web/20081227002219/http://malektips.com/file_extensions_0016.html |archivedate=2008-12-27 ))
* ((cite web|url=http://support.microsoft.com/kb/93328 |title=FoxPro Commands That Create Backup (.BAK & .TBK) Files |archiveurl=https://web.archive.org/web/20150114080023/http://support.microsoft.com/kb/93328 |archivedate=2015-01-14 ))

==References==
((Reflist))

[[Category:Filename extensions]]


((computing-stub))

Pages transcluded onto the current version of this page (help):

Bak file (edit)
Template:Ambox (view source) (template editor protected)
Template:Asbox (view source) (template editor protected)
Template:Asbox/styles.css (view source) (template editor protected)
Template:Cite web (view source) (protected)
Template:Compu-stub (view source) (semi-protected)
Template:Computing-stub (edit)
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Template:Hlist/styles.css (view source) (protected)
Template:Lead extra info (view source) (semi-protected)
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Template:Mi (view source) (semi-protected)
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Template:Multiple issues (view source) (template editor protected)
Template:Multiple issues/styles.css (view source) (template editor protected)
Template:Pagetype (view source) (protected)
Template:Reflist (view source) (protected)
Template:Reflist/styles.css (view source) (protected)
Template:SDcat (view source) (template editor protected)
Template:Short description (view source) (protected)
Template:Short description/lowercasecheck (view source) (protected)
Template:Trivia (view source) (semi-protected)
Template:Trivia section (edit)
Template:Yesno (view source) (protected)
Module:Arguments (view source) (protected)
Module:Asbox (view source) (template editor protected)
Module:Buffer (view source) (template editor protected)
Module:Category handler (view source) (protected)
Module:Category handler/blacklist (view source) (protected)
Module:Category handler/config (view source) (protected)
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Module:Category handler/shared (view source) (protected)
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Module:Citation/CS1 (view source) (protected)
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Module:Citation/CS1/Utilities (view source) (protected)
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Module:Pagetype/disambiguation (view source) (template editor protected)
Module:Pagetype/setindex (view source) (template editor protected)
Module:Pagetype/softredirect (view source) (template editor protected)
Module:SDcat (view source) (template editor protected)
Module:String (view source) (protected)
Module:Unsubst (view source) (protected)
Module:Wikitext Parsing (view source) (template editor protected)
Module:Yesno (view source) (protected)

Return to Bak file.

Retrieved from "https://en.wikipedia.org/wiki/Bak_file"