{
  boot.tmp.cleanOnBoot = true;

  preservation = {
    enable = true;

    preserveAt."/persist" = {
      files = [
        {
          file = "/etc/machine-id";
          inInitrd = true;
        }
      ];
      directories = [
        "/var/lib/systemd/timers"
        "/var/lib/nixos"
        "/var/log"
        "/var/lib/bluetooth"
        "/tmp"
      ];
    };
  };
}