diff --git a/flake/nixosConfigurations.nix b/flake/nixosConfigurations.nix
index 387a369..7bc6e35 100644
--- a/flake/nixosConfigurations.nix
+++ b/flake/nixosConfigurations.nix
@@ -67,6 +67,7 @@
                   ];
                 };
                 home-manager.extraSpecialArgs = mkArgs system;
+                home-manager.backupFileExtension = "backup";
               }
               (self + /nixos)
               (self + /hosts/${hostName})