diff --git a/jobs.nix b/jobs.nix
index 7c3a4ac..73d0676 100644
--- a/jobs.nix
+++ b/jobs.nix
@@ -64,7 +64,7 @@ with lib;
   in {
     description = "system backup";
     after   = [ "network-online.target" ];
-    startAt = "weekly";
+    startAt = "*-*-* 03:00";  # every day at 3:00
 
     serviceConfig = {
       Type = "oneshot";