Includedin the AutoCAD Express Tools is the MOVEBAK command which allows you to specify an alternative folder for your bak files when created. If you want to keep all your bak files in a single location—as opposed to keeping them in the same folder as the associated drawings—you can use MOVEBAK to specify another folder and all bak files will be automatically moved there when created. Enter "." as a value to reset AutoCAD to the default behavior.