Unity 5 GI baking

Just a general question about GI Baking. It seems like a really awesome system and I love how it bakes while you continue working. But I got to a part in my project where I wanted to see the final lighting and left my project running an entire evening to finish up the baking process. It was finished after a night and lightning seemed pretty good. I saved project and scene, but this morning when I opened my project the lightning was gone and GI started baking again even though I changed nothing… It did seem to go faster after a while and remembering some of the baking. But do you really have to rebake everytime you open the project? That can’t be right? I would like to work in the scene with a bit of the baking done already.

Is there any way to save the baked GI or to stop it from rebaking so I can keep seeing the baked lightning?
I suppose turning auto GI baking off is a solution? But why is it that auto removes baking it done before, just doesn’t seem logical…

Disable Auto bake, its located on the bottom in Lighting settings and rebake manually whenever you wish by pressing Build