[1attice]

> Just adding variety reduces the chance of having all the important repos up at the same time.

this, sadly, is correct, and the solution you propose is also correct.

The only other option would be for the NixOS Foundation to mirror the git repo of _every single important package_, and I know they're already struggling with the prohibitive cloud costs of hosting just the build objects. :/

[kelnos]

They could mirror them on gitlab.com if they wanted to. It wouldn't even be that difficult to set up and automate.