Haha, well I'm not an expert but I've been doing this for a while. But I'm glad if I can give any good tips :)

For a short process with back-uping the sourdough starter, you can check my old post in here.
Simply, that's from dried sourdough -> reactivating -> drying again.

It's important to keep in mind that sometimes it's faster and sometimes it needs more time. As everything can always change.