It's from a lecture.
Professor: So I wanted to discuss a few other terms here ... actually, some, uh, some ideas about how we manage our resources. Let’s talk about what that …what that means. If we take a resource like water. ..well, maybe we should get a little bit more specific here-back up from the more general case-and talk about underground water in particular. So hydrogeologists have tried to figure out... how much water can you take out from underground sources? This has been an important question.Let me ask you guys: how much water, based on what you know so far, could you take out of, say, an aquifer... under the city?
I don't understand the phrase "back up" in "maybe we should get a little bit more specific here-back up from the more general case-and talk about underground water in particular.", does it mean the Professor wants to use something more general to support his point of view?