there is no option to save the replays. If you are talking about quickrace or even career there is an option to watch the whole race replay but not save it. In that case you would need a video capture card such as this Elagato Gamecapture HD
If you are talking about mutiplayer races then there is no replay, you have to record the race as it happends, but then the only car you will see is your own which can lead to boring videos realy.
