{
  description = "OpoenGL testing";

  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";

  outputs =
    { self, nixpkgs }:
    let
      allSystems = [
        "x86_64-linux"
        "aarch64-linux"
        "x86_64-darwin"
        "aarch64-darwin"
      ];
      forAllSystems =
        f:
        nixpkgs.lib.genAttrs allSystems (
          system:
          f {
            pkgs = import nixpkgs { inherit system; };
          }
        );
    in
    {
      nixosModules.backup-helper = import ./backup.nix;
      nixosModules.default = self.nixosModules.backup-helper;

      devShells = forAllSystems (
        { pkgs }:
        {
          default = pkgs.mkShell {
            packages = with pkgs; [
              restic
              bash
              jq
              curl
            ];
          };
        }
      );
    };
}