Other benefits of just mirroring stuff:
1) You can protect tags or branches as you like and therefore make sure no (malicious) rewrites take place without your okay
2) You can base your projects on your mirror and make sure a disappeared project doesn't break your builds/infrastructure.
And of course, you can provide an "neutral proof" for the history of a project, if they have some kind of legal fight going on.
@sheogorath I'm also starting to do this now, but I'd still give the original repo a star if it doesn't already have more than 10k stars 😉
I stopped starring as soon as Microsoft bought it. I imported the stars into Zotero and deleted them.
Once done I continue to collect metadata of interesting repositories in Zotero.
This is my personal microblog. It's filled with my fun, joy and silliness.