In the event of a global zombie apocalypse GitHub servers would most probably get shut down.
It is not very wise to keep all the code on their servers exclusively.
I have put together a small Python script that creates a local copy of all my work.
Ironically, I package it as a repo... and upload to GitHub -_-
conda create --name github-hoarder
conda activate github-hoarder
conda install pip
pip install PyGithub