Restart every time with enlighten?

If I bake lighting for my scene with enlighten, and move a tiny rock a few feet, and tell it to bake again, does it rebake the entire scene?

 

Enlighten does only backe stuff again that has changed / what will be influenced by your changes.

if you bake realtime gi and use realtime shadows:
It might be a good idea to exclude small objects that do not really contribute to the gi from the backe and have them receive light from light probes.