diff --git a/machines/nix-book/configuration.nix b/machines/nix-book/configuration.nix
index 97657b5..9b66099 100644
--- a/machines/nix-book/configuration.nix
+++ b/machines/nix-book/configuration.nix
@@ -39,6 +39,15 @@
 
   boot.kernelPackages = pkgs.linuxPackages_latest;
 
+  # Btrfs deduplication service
+  services.beesd.filesystems = {
+    root = {
+      spec = "/";
+      hashTableSizeMB = 32;  # 128MB per TB recommended, ~225GB = ~32MB
+      verbosity = "err";     # Only show actual problems
+    };
+  };
+
   # Enable networking
   networking.networkmanager.enable = true;