Retain official copy in office two (2) years, then transfer to the State Archives for permanent preservation. Retain one (1) copy in office permanently. 

OR

Retain official copy in office two (2) years, then store official copy in optical disk format. Transfer official copy to the State Archives for permanent preservation after storing a back up copy of the disk in an off site storage area that meets the manufacturer's recommendations for temperature and humidity controls; or if no recommendations are provided by the manufacturer, after storing the back up disk in an off site storage area whose temperature is between 65º and 75º Fahrenheit and whose relative humidity is between 30% and 50%.