I know the basics of saving yeast and yeast washing, but i want to try harvesting some wild yeast locally. If I get something I really like and want to keep going for a long time, what is the best way to keep some of the origional strain preserved for the future? Should I keep some of the 1st starter separate and build it up? Mainly want to be able to go back to it many times in the future and have it be the same as it was when I first isolated. Thanks for any input.