Lightroom files on MacBook

Hi i seem to have 100's of backups now on my machine as i have never delted these. Am i correct in thinking i only really need the last one? all edits previously made, colour coding and star rating tc will be catptured in that last one? Also there is a larger file that saves at the same time although it saves in a diffeent folder  quite a large one i suspect i need to keep this?