You will need to backup your OnBase.ini file.
You will need to backup your copy of the Winhook.DLL file if Client Access is being used.
You will need to backup your copy of the Term_In.Log file.
You will need to backup any OnBase keymapping files that are being used.
You will need to backup any configuration information and settings used for any third party host applications that are being used (ex. RUMBA, Client Access)