I guess when I think local posting, I think of posting to your local machine, I don't know enough about Blue Sky to know if they have different scopes of posting kind of like the Fediverse does.

Like, for instance, in the Fediverse, you had your local feed, which was your instance specific feed. There's the global feed, which is everyone that you're federated with, and then there's your home feed, which was everyone you followed.

I know you can kinda Host your own instance in blue sky, but as far as I was aware, even self-hosted instances had to connect back to the central server for pretty much everything.