diff --git a/hosts/silicon/services/borgbackup/default.nix b/hosts/silicon/services/borgbackup/default.nix
index e4a686d..85cdde1 100644
--- a/hosts/silicon/services/borgbackup/default.nix
+++ b/hosts/silicon/services/borgbackup/default.nix
@@ -41,6 +41,6 @@
       passCommand = "cat ${config.age.secrets.borgbackup.path}";
     };
     compression = "auto,zstd";
-    startAt = "daily";
+    startAt = "12:00";
   };
 }
diff --git a/hosts/silicon/system/nix/default.nix b/hosts/silicon/system/nix/default.nix
index 244ce6b..5fdb0ff 100644
--- a/hosts/silicon/system/nix/default.nix
+++ b/hosts/silicon/system/nix/default.nix
@@ -18,13 +18,13 @@
   nix.settings.auto-optimise-store = true;
   nix.optimise = {
     automatic = true;
-    dates = "daily";
+    dates = "12:00";
   };
 
   # garbage collection
   nix.gc = {
     automatic = true;
-    dates = "daily";
+    dates = "12:00";
     options = "--delete-older-than 30d";
   };