I’ve been experimenting with dehydrating my sourdough starter Fred. He is a strong guy and definitely deserves to be backed up.
I placed portions of it on dehydrator sheets and dried it. Then I ground it in coffee grinder and kept in an air tight jar.
I am now playing with rehydration, aiming to shorten the amount of time it takes to get it back into strong active state. Rehydrating definitely works but will require a bit more experimentation. Will report back on my progress.