I heard Nicola Solomon of the Society of Authors speak yesterday. She was talking about the drop in sales of traditional books, among other things. I learnt from her that these days books are referred to as "legacy media". Wikipedia has a page on legacy media, or old media. It describes such media as traditional means of communication that existed before the internet - things like radio and newspapers. 'New media' is an entry in the OED. The first citation is from 1954, but then the 'new media' were television and radio, and the 'old media' were newspapers. Interestingly, the first recorded written example of 'new media' is later than this - 1960.