Github, hosts many valuable and important projects/programs. As time passes, you are adding more and more, GitHub, projects on your PC and you reach a point, that either you have forgot them or when you reinstall your OS, you don't remember what you had installed. So, an easy way to store a backup list of all the GitHub/GitLab repositories you use, is the following oneliner script:
for line in $(locate .git | grep /.git$); do cd "$line"; cat config | grep url | cut -d "=" -f2; done;
This command, will find all the downloaded repositories, and get the actual URL of the project, from its config file. Now you can store this list, however you want and when it's needed you can use it to reinstall your favorite apps.