What is BAK? What Opens a BAK? File Format List from WhatIs.com

File Extension

BAK File Format

Backup file

BAK is a file extension for a file format typically used when creating a backup copy of a file. 

Normally, a BAK file is created as an automatic backup when an application is editing or making changes to the file in question. Certain database applications use BAK files when making a backup copy of their database. 

Mozilla Firefox also uses “bookmarks.bak” file to make an automated bookmarks backup.

 

Learn more about .BAK files:

ITKnowledgeExchange.com offers hundreds of questions and answers about backup and recovery.

SearchStorage.com offers tutorials, news and expert advice related to backups.

This was last updated in July 2010
Editorial Director Margaret Rouse

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