diff --git a/modules/services/caldav.nix b/modules/services/caldav.nix
index a26564a..af0aeab 100644
--- a/modules/services/caldav.nix
+++ b/modules/services/caldav.nix
@@ -23,22 +23,26 @@ in {
       };
     };
     custom.misc.backup = lib.mkIf config.custom.misc.backup.enable {
-      small = [ "/var/lib/radicale/"];
-      medium = [ "/var/lib/radicale/"];
-      large = [ "/var/lib/radicale/"];
+      small = [ "/var/lib/radicale/" ];
+      medium = [ "/var/lib/radicale/" ];
+      large = [ "/var/lib/radicale/" ];
     };
 
-    systemd.services.kop-fhcalendar = {
+    systemd.services.kop-fhcalendar = let
+      radicale = builtins.elemAt
+        config.services.radicale.settings.storage.filesystem_folder 0;
+      # not reproducible
+      working =
+        "${radicale}/collection-root/kopatz/b6d2c446-8109-714a-397f-1f35d3136639";
+    in {
       description = "Download fh calendar";
       wants = [ "network-online.target" ];
       after = [ "network.target" "network-online.target" ];
       wantedBy = [ "multi-user.target" ];
+      startAt = "*-*-* 06:00:00";
 
-      serviceConfig = let 
-        # stinky
-        radicale = builtins.elemAt config.services.radicale.settings.storage.filesystem_folder 0;
-        working = "${radicale}/collection-root/kopatz/b6d2c446-8109-714a-397f-1f35d3136639";
-        in {
+      serviceConfig = {
+        Type = "oneshot";
         ExecStart = "${pkgs.kop-fhcalendar}/bin/kop-fhcalendar";
         WorkingDirectory = working;
         BindPaths = [ working ];
diff --git a/pkgs/kop-fhcalendar/default.nix b/pkgs/kop-fhcalendar/default.nix
index 456d8af..5e7d55d 100644
--- a/pkgs/kop-fhcalendar/default.nix
+++ b/pkgs/kop-fhcalendar/default.nix
@@ -1,8 +1,4 @@
-{ rustPlatform
-, lib
-, pkgs
-, ...
-}:
+{ rustPlatform, lib, pkgs, ... }:
 rustPlatform.buildRustPackage {
   pname = "kop-fhcalendar";
   version = "1.0.0";
@@ -10,8 +6,8 @@ rustPlatform.buildRustPackage {
   src = fetchGit {
     url = "git@github.com:kropatz/kop-fhcalendar.git";
     ref = "master";
-    rev = "c765949de30eeea99241e9f2ba4d9b5d30c43a1b";
+    rev = "d1f1eca9b38a47cee18023440fefde7e3e01ccc4";
   };
 
-  cargoHash = "sha256-IrTBLJ3bAe+xveZa5eEz7K51zsM+EQokQNR//1ZHbBk=";
+  cargoHash = "sha256-yx71/6UqD5RDsISeXhQj/zuyLW2Eit32pHYyZBExauE=";
 }