Saving backsets

[Moonshine31]

So in the recipe that I'm going to try first says I can save all my baskets abd grains for later. After I use my 55lbs of malted barley can I freeze it and make a mash again? I've read that someone says they use it 5x then throw it away. If this is true that means that the whiskey will cost almost nothing per bottle if u can use it 5x.
I'm guessing I would Hage to add sugar or something after a few times but I'm wondering how can I go about doing this.