diff --git a/systems/pinebook-pro.nix b/systems/pinebook-pro.nix
index 499d337..af1193d 100644
--- a/systems/pinebook-pro.nix
+++ b/systems/pinebook-pro.nix
@@ -10,8 +10,6 @@
 
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
-  nix.settings.experimental-features = [ "nix-command" "flakes" ];
-
   boot.loader = {
     efi = {
     canTouchEfiVariables = false;
@@ -57,6 +55,14 @@
     "rtc_rk808"
   ];
 
+  nix.settings.auto-optimise-store = true;
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nix.gc = {
+     automatic = true;
+     dates = "weekly";
+     options = "--delete-older-than 30d";
+   };
+
   networking = {
     hostName = "pbp";
     networkmanager.enable = true;