Why You Should Never Throw Anything Out
At least when you're writing. You never know when you might find a use for it later. Case in point: Back in February I was working on this intense scene that went on and on and on and I was getting great information out and writing well...and realized I was doing an info dump and inflicting my research on unsuspecting readers. So I took all that work and put it in a new file.
Today I was writing and realized some of that clipped stuff might fit where I was today. Not all of it, you'll be glad to hear--I do realize not everyone finds Florida's history as fascinating as I do--but enough to move me substantially along in the scene I was writing.
So when you're writing, either save your old pages or start a new file. Someday you might be glad you don't have to go back and do it all over again.