RubyGems doesn't have anything particularly better here, unless you're maintaining your own gem server. If Facebook deleted the repo and the gemcutter publishe

RubyGems doesn't have anything particularly better here, unless you're maintaining your own gem server. If Facebook deleted the repo and the gemcutter published gem, you'd be in the same boat. If gemcutter disappeared (even temporarily due to an outage), you'd also be stuck. In general, you should mirror external dependencies to the extent you're risk-averse. Mildly paranoid startup? Fork any github repos that might disappear and that don't already have forks you trust. Running a large financial institution? Run your own gem server, apt repo, etc.