Please forum, I want to understand why it is necessary to create .bak file for database before hosing to a windows server
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bak is a filename extension used to backup copy of a file.
When a program is about to overwrite an existing file the program first make a copy of the existing file, with . bak appended to the filename.
Its used to store a backup of data.
So if any reason your data lost or deleted then you can restore it from bak file.