'.BAK' extension refers usually to what kind of file?
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In computing, “.bak” is a filename extension commonly used to signify a backup copy of a 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 .bak appended to the filename. This common .bak 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 operating system crash, power outage, or disk space exhaustion.
In computing, “. bak” is a filename extension commonly used to signify a backup copy of a file.