What role did the evacuation in the USSR play during the Great Patriotic War?

The USSR was not quite ready for the fact that Germany would attack in 1941, because it planned to fight on foreign territory, moreover, a non-aggression pact was signed between the countries. Therefore, Germany easily entered the territory of the USSR, having advanced significantly deeper. So, the evacuation of strategically important enterprises was decisive here, because the equipment did not fall into the hands of the invaders, and it also became possible to produce military equipment and supply it to the front, which played a decisive role in the course of the war.