options    = "--delete-older-than 7d";

    options    = "--delete-older-than 3d";

      min-free = "4G";
    };

  };
  nix.extraOptions = mkIf config.isServer ''
    min-free = ${toString (2 * 1024 * 1024 * 1024)} # 2G
    max-free = ${toString (1 * 1024 * 1024 * 1024)} # 1G
  '';