diff --git a/hosts/common/global/default.nix b/hosts/common/global/default.nix
index b6d6336..f70b6cf 100644
--- a/hosts/common/global/default.nix
+++ b/hosts/common/global/default.nix
@@ -41,8 +41,9 @@
     "8.8.8.8"
   ];
 
-  # HM
-  home-manager.useGlobalPkgs = true;
+  # HM module
+  home-manager.useGlobalPkgs = true; # hm module uses the pkgs of the nixos config
+  home-manager.backupFileExtension = "hm-backup"; # backup conflicting files. So hm activation never fails
   home-manager.extraSpecialArgs = {
     inherit inputs outputs;
   };