Would be nice if UE4 supported “Build & Save”. It does exactly what you think it would. It builds the entire map, then once finished, it saves. Seems kind of silly to have to do this manually, since 99.99% of the time, I’m saving immediately afterwards anyway.
Sometimes, for those long lighting builds, I will build lighting, then walk away from my PC. If I lose power, well, now I have to hope UE4 autosaved. An annoying hassle.