{ ... }:
{
  environment.persistence = {
    "/nix/persist" = {
      hideMounts = true;
      directories = [
        "/var/lib"
        "/var/log"
        "/etc/nixos"
        "/opt"
      ];
      files = [
        "/etc/machine-id"
        "/etc/nix/id_rsa"
      ];
    };
  };
}