baking（.bak）

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.bak is a file extension commonly used for backup files in various software programs, particularly in text edi […]                                
                                .bak is a file extension commonly used for backup files in various software programs, particularly in text editors and programming environments. When you save a file as a .bak, it creates a copy of the original file, typically to prevent loss of data in case the main file gets corrupted or accidentally modified. These backup files can be restored if needed, ensuring that the user has access to an earlier version of their work.