A guide to understanding 'Persistent Context'

I'm aware of the three contexts and how they are used. What I was not clear on is if this new feature of using the new "localfilesystem" option is available outside of just flow.
e.g.
node.set("name", "value", "storeInFile");
global.set("name", "value", "storeInFile");

Which the Docs or the guide above did not cover. Granted the new comment below from @zenofmud however, does state that the "localfilesystem" option is available to all context scopes. e.g. node, flow & global

Thanks for the clarity.