When it comes to synonyms for the phrase "most backstage", there are several options to choose from depending on the intended context. In the context of theater, some synonyms can be "behind the scenes," "offstage," or "backstage area." In the context of a concert or performance, "green room," "dressing room," or "artist's lounge" could be used. For those referring to the inner workings of a production, "production area," "crew quarters," or "support area" may be more suitable. Additionally, some might use "behind the curtain," "in the wings," or "out of sight" to describe this area of a performance.