diff --git a/backend.py b/backend.py
index b2f38b7..74d3e52 100755
--- a/backend.py
+++ b/backend.py
@@ -27,8 +27,13 @@ def main(params):
     os.makedirs(params['dest_dir'], exist_ok=True)
 
     nodes_fn = os.path.join(params['dest_dir'], 'nodes.json')
+    tmp_nodes_fn = os.path.join(params['dest_dir'], 'nodes.json.tmp')
+
     graph_fn = os.path.join(params['dest_dir'], 'graph.json')
+    tmp_graph_fn = os.path.join(params['dest_dir'], 'graph.json.tmp')
+
     nodelist_fn = os.path.join(params['dest_dir'], 'nodelist.json')
+    tmp_nodelist_fn = os.path.join(params['dest_dir'], 'nodelist.json.tmp')
 
     now = datetime.utcnow().replace(microsecond=0)
 
@@ -137,18 +142,22 @@ def main(params):
     batadv_graph = graph.to_undirected(batadv_graph)
 
     # write processed data to dest dir
-    with open(nodes_fn, 'w') as f:
+    with open(tmp_nodes_fn, 'w') as f:
         json.dump(nodedb, f)
 
     graph_out = {'batadv': json_graph.node_link_data(batadv_graph),
                  'version': GRAPH_VERSION}
 
-    with open(graph_fn, 'w') as f:
+    with open(tmp_graph_fn, 'w') as f:
         json.dump(graph_out, f)
 
-    with open(nodelist_fn, 'w') as f:
+    with open(tmp_nodelist_fn, 'w') as f:
         json.dump(export_nodelist(now, nodedb), f)
 
+    os.rename(tmp_nodes_fn, nodes_fn)
+    os.rename(tmp_graph_fn, graph_fn)
+    os.rename(tmp_nodelist_fn, nodelist_fn)
+
     # optional rrd graphs (trigger with --rrd)
     if params['rrd']:
         script_directory = os.path.dirname(os.path.realpath(__file__))
diff --git a/mkmap.sh b/mkmap.sh
index b49f9a5..2d9b0f6 100755
--- a/mkmap.sh
+++ b/mkmap.sh
@@ -3,4 +3,4 @@ FFMAPPATH='/opt/ffmap-backend/'
 PEERS="/etc/fastd/ffhh-mesh-vpn/peers"
 
 python2 $FFMAPPATH/generate_aliases.py $PEERS > $FFMAPPATH/aliases.json
-python3 $FFMAPPATH/backend.py -d /var/www/meshviewer/ --aliases $FFMAPPATH/aliases.json $FFMAPPATH/gateway.json -m bat0:/var/run/alfred.sock -p 30 --vpn de:ad:be:ff:01:01 --vpn de:ad:be:ff:05:05 --vpn de:ad:be:ff:05:06 --vpn de:ad:be:ff:03:03 --vpn de:ad:be:ff:22:22 --vpn de:ad:be:ff:22:23 --vpn de:ad:be:ff:88:88 --vpn de:ad:be:ff:88:89 --vpn de:ad:bf:ff:88:88 --vpn de:ad:bf:ff:22:22 --vpn de:ad:bf:ff:03:03 --vpn de:ad:bf:ff:05:05 --vpn de:ad:bf:ff:01:01
+python3 $FFMAPPATH/backend.py -d /var/www/meshviewer/ --aliases $FFMAPPATH/aliases.json $FFMAPPATH/gateway.json -m bat0:/var/run/alfred.sock -p 30 --vpn de:ad:be:ff:01:01 --vpn de:ad:be:ff:05:05 --vpn de:ad:be:ff:05:06 --vpn de:ad:be:ff:03:03 --vpn de:ad:be:ff:22:22 --vpn de:ad:be:ff:22:23 --vpn de:ad:be:ff:88:88 --vpn de:ad:be:ff:88:89 --vpn de:ad:bf:ff:88:88 --vpn de:ad:bf:ff:22:22 --vpn de:ad:bf:ff:03:03 --vpn de:ad:bf:ff:05:05 --vpn de:ad:bf:ff:01:01 --vpn de:ad:be:fc:03:03 --vpn 00:16:3e:53:75:0d --vpn de:ad:be:fc:05:05 --vpn de:ad:be:fc:01:01 --vpn de:ad:be:ef:03:03 --vpn de:ad:be:ef:01:01 --vpn de:ad:be:ef:05:05