feat(mottarone): add urbackup

systems/mottarone/urbackup.nix

@@ -0,0 +1,32 @@
+{ lib, pkgs, ... }:
+{
+  # requires overlay, see exprs/overlay.nix
+  environment.systemPackages = [ pkgs.urbackup-client ];
+
+  systemd.services."urbackup-client" = {
+    after = [
+      "syslog.target"
+      "network.target"
+    ];
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig = {
+      ExecStart = "${lib.getExe' pkgs.urbackup-client "urbackupclientbackend"} --config /etc/default/urbackupclient --no-consoletime";
+      # these paths are hardcoded in the binary, see overlay
+      StateDirectory = "urbackup urbackup/data";
+      WorkingDirectory = "/var/lib/urbackup";
+    };
+  };
+
+  networking.firewall = {
+    allowedTCPPorts = [
+      # "Sending files during file backups (file server)"
+      35621
+      # "Commands and image backups"
+      35623
+    ];
+    allowedUDPPorts = [
+      # "UDP broadcasts for discovery"
+      35622
+    ];
+  };
+}