Looking for your personal lists of Github repositories, which might be deleted from Github at some point, for whatever reason. For example, the maintainer might delete his account from Github or archive all his repositories.
A famous example of an open source project, which had trouble to continue thriving, is youtube-dl.
Which projects’ repositories do you think are worth backing up?
Dunno about docker setup, but I mirror github repos I worry may disappear automatically using my self-hosted gogs instance. (Gitea/Forgejo likely also can do it). It’s point-and-click, you just specify the github URL and check a box “this is a mirror”.