"Public records" means any paper, correspondence, completed form, record book, photograph, map, or drawing, regardless of physical form or characteristics, and including records stored on magnetic, electronic, or optical media, and including all copies thereof, that have been made by any agency or received by it in connection with the transaction of public business. And includes any writing containing information relating to the conduct of government or the performance of government or proprietary function prepared, owned, used, or retained by the state or local agency regardless of physical form or characteristics.