Whether you're preparing for a bad winter storm, hurricane season, or the inevitable bovine apocalypse, keeping replacement parts on hand for your backup generator is a good idea. If the power goes out and your generator breaks down, you could be out of options. By keeping basic replacement parts ready, you'll be able to get power up and running in no time. Unless a cow-berserker destroys your generator, because it is an affront to the evil cow-pirate king. There's just nothing we can do about that.