Add borgbackup support

module.nix

@@ -44,11 +44,19 @@ in
         type = types.str;
         description = "Data directory.";
       };
+      backupDir = mkOption {
+        default = "/var/backup/strojnadzor";
+        type = types.str;
+        description = "Backup directory.";
+      };
       socketPath = mkOption {
         default = "/run/strojnadzor.sock";
         type = types.str;
         description = "UNIX socket path.";
       };
+      borgbackup = {
+        enable = mkEnableOption "backup via borgbackup";
+      };
     };
   };
 
@@ -65,6 +73,7 @@ in
     systemd.tmpfiles.rules = [
       "d '${cfg.stateDir}/db' 0700 strojnadzor strojnadzor - -"
       "d '${cfg.stateDir}/media' 0755 strojnadzor strojnadzor - -"
+      "d '${cfg.backupDir}/borg' 0700 strojnadzor strojnadzor - -"
     ];
 
     systemd.sockets.strojnadzor = {
@@ -133,5 +142,15 @@ in
         };
       };
     };
+
+    services.borgbackup.jobs.strojnadzor = mkIf cfg.borgbackup.enable {
+      paths = [ cfg.stateDir ];
+      repo = "${cfg.backupDir}/borg";
+      compression = "auto,lzma";
+      encryption.mode = "none";
+      startAt = "hourly";
+      user = "strojnadzor";
+      group = "strojnadzor";
+    };
   };
 }