diff --git a/suites/default.nix b/suites/default.nix
index 38529df..359d342 100644
--- a/suites/default.nix
+++ b/suites/default.nix
@@ -14,6 +14,12 @@ with lib; {
     # Set $NIX_PATH.
     nixPath = ["nixpkgs=${inputs.nixpkgs}"];
 
+    # Optimise store.
+    optimise = {
+      automatic = true;
+      dates = "daily";
+    };
+
     settings = {
       # Enable flakes.
       experimental-features = [
@@ -289,7 +295,8 @@ with lib; {
     enable = true;
     clean = {
       enable = true;
-      extraArgs = "--keep 5";
+      extraArgs = "--keep 3";
+      dates = "daily";
     };
   };