diff --git a/home/plasma/nixos.nix b/home/plasma/nixos.nix
index 87b551cd..8eba21f7 100644
--- a/home/plasma/nixos.nix
+++ b/home/plasma/nixos.nix
@@ -23,7 +23,9 @@ in {
     services.desktopManager.plasma6 = mkIf cfg.enable {
       enable = true;
     };
-    home-manager.sharedModules = mkIf cfg.enable [
+
+    home-manager.backupFileExtension = mkIf cfg.enable "old";
+    home-manager.sharedModules = [
       plasma-manager.homeManagerModules.plasma-manager
     ];