I have trialled storing George (of the Jungle) in a number of different ways. Good thing George adores me ... 'cause some of the ways, he didn't like so much (but he's vigorous enough, that he flatly refused to die).
So, sourdough George has been stored ...
1/ As a wet sourdough starter (thick pancake texture).
This method takes lots of feeding, as seems to work best at a warmish temperature (faster, warmer, wetter)
2/ As a dry sourdough starter (a dry mix, then embedded in flour)