In-Game Replays Please?

HoS is out for Blizzard and while it is similar to league in many ways, one of the main Advantages is that it can replay. This is a pretty small thing, but it means a lot. I need to download all this random stuff from online for League like LoLReplay and stuff, which sometimes doesn't even work properly! I mean, seriously I fricken need to download a whole program just so that I can upload a big play I made while I wasn't bothering to record earlier. I'm sorry, but I can't record every little game I play. I don't have enough MEMORY. So it would be really useful for a replay button. Not every game, maybe just the last one so that if I make a big play, I can go back to it.