Why? There's sooooooo much electronic equipment in the world right now. Huge datacenters, landfills filled to the brim with electronics. I think it's a stretch to assume that would all just evaporate.

You could load the entirety of Wikipedia onto an e-reader and power it with almost no electricity.

Data centers are basically bunkers and there is a tremendous amount of replication occurring.

If anything I think we're likely to leave by far the largest accumulation of knowledge in history, regardless of how bad things get.