I collected yeast (WY3068) from 4 bottles of my home brew (homebrew) wheat beer (witbier). These harvested yeast were then pitched in a small starter to build numbers of healthy yeast cells. Number of yeast cells more than doubled during the first starter. The yeast were washed and placed in refrigerated storage for a future homebrew batch. I will pitch this yeast in another starter prior to that next batch.
This is an easy way to save yeast, save money (if you're a home brewer), and enjoy the hobby.