What is BAK?
BAK is commonly used as a filename extension for backup or copy of a file in the computer world. Whenever a user accesses a file or modifies an existing file, then it is automatically saved as a BAK file, just to make a backup so that if something goes wrong and the user doesn’t get the time to save it, then he won’t lose all the information.
BAK files are created by every application automatically, which includes FoxPro, SQL server, SML shells, etc., all these create .bak files for their databases. Since these are generic files and are created automatically, so, by default they were saved in the device and require manual cleaning, if you want to get rid of them.
Technobezz Explains BAK
A file having a BAK extension means it is a backup file. Many applications create these BAK files during their runtime or auto save process. There are many applications or programs which create the backup for the important files, so that if they lose them, they have a backup of it. It’s easy to restore the original file using these BAK files. You can make backup for all your important files manually, and store them with .bak extension.