Storing fresh sourdough
I don’t think it is possible to perfectly preserve both crisp crust and moist crumb. There is always going to be a degree of equalisation of moisture between crust and crumb. 

The only way to have the experience of fresh baked bread every day is to bake it every day. That said, one of the joys of sourdough is its characteristic ageing. It’s perfect with butter on day one, by day two it’s good for sandwiches and by day three it’s perfect for toasting. 

My preferred method for storing is wrapped in a cotton cloth and kept in a metal breadbin.