Whether you purchase chicken backs in a large package and don't need all of them or you have a back leftover from a whole chicken you butchered, you can put what you don't need right away in the freezer. Place the back or backs in a plastic freezer bag, and press out all the air. Seal the bag tightly, and put it in the freezer. Raw chicken will last for a long time in the freezer, but the USDA recommends consuming frozen raw chicken parts within nine months.  When you are ready to use the backs, pull the package out of the freezer, and put it in the lower part of the fridge to thaw it out. This will ensure the chicken never exceeds the refrigerator's temperature, keeping it safe at all times. If you don't have time to thaw chicken back in the fridge, you can run it under cold water.