The .bak file is the same as .dwg and .dxf files, but used by AutoCAD for automate backup of project files.
The .bak file extension is used by AutoCAD to store automate backups of project files (DWG, DXF file extensions). Simply rename bak extension to dwg and see if you can open the file in AutoCAD. This is pretty much the only particular bak to dwg conversion we know of, but similar CAD programs may use bak files for backup purposes as well.
It is unlikely that you will find some bak file converter online that would allow you to convert bak to dwg.
Updated: April 20, 2017
Unfortunately, there is no detailed software record in the database for this conversion.
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