Due to the sometimes unreliable connection to network drives, it is not recommended (and unneeded) to place the BusinessServer folder on a network drive.
Individual users can copy files from the "BusinessServer" folder into their own "Business" folders in the "Files" tab of the client, project, etc. they are working on.
For more details, please read the "File storage and Management" chapter in the Projetex help file (press F1 in any table or "New/edit" window to call it up).