The Planet of the Eternals must also have some system in place such that the Computers don't go out of order and is continuously repaired and upgraded and the Planet is not ravaged by destruction by Natural or External influences. Is this maintained by Biological Robots or AI systems? But then can the Biological Robots or AI systems handle new threats or problems such as Planetary or Galactic upheavals or an ExtraPlanetary object crashing into the Planet or excess Vegetation & forestation running amock etc. In such a situation continuity of survival of the Eternals may be at stake if there are no Physical Eternals to handle the situation or emergency, right? Is there has to be a system & mechanism in place?
Rael did not give specifics. He only told us that they have many "back-ups" all over the galaxy to counteract any possible adverse events.