When I use dvdfab to backup my blu-ray disc it takes forever, so I was going to just copy the main movie instead of the full disc. However there are like 4 different versions/angles of the same video (the full movie) What is all that? Do you need all of them, is there a difference in them? What do I need to copy/select in the main movie area to get the full quality audio and video of the movie alone? I do not care about previews or extra features.