The workd is restored quickly also because they built a kind of backup of all human scientific knowledge and bunked on high mountains

__________________________________________________________________

world cannot go back to medieval age too much computers and books everywhere internet etc it's impossible

__________________________________________________________________

no, it cannot. Unless it destroys entire earth, it would be only temporary and limited to few Nations.

__________________________________________________________________

an event like asteroid etc would delay singularity only of 2 years, not 200 years!