[Nix-dev] why has each revision / generation not a own configuration.nix

[Stefan Huchler]

Hi,

I find it always strange, that when I revert back or boot a older
version of nixos, the configuration file has no version that reflected
that version. So I have to seperatly have to backup the
configuration.nix file.

Could there not be at least a backup of the config used in that
generation somewhere (or is there somewhere one) when you build a
generation?