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by anon291 1379 days ago
> On the other hand, I was able to just boot up an older configuration to get back to functional, and that let me figure out wtf was wrong.

I would count this as not breaking. I mean... on most systems, you are borked if an upgrade fails and now need to boot a live CD. I've never had that happen on NixOS. I had it happen only once, and that was due to a bad ZFS setting that the OS couldn't possibly have fixed (weird BIOS thing where the SATA drives came up incorrectly).