diff --git a/flake.nix b/flake.nix
index 1da96ff..217cdaf 100644
--- a/flake.nix
+++ b/flake.nix
@@ -159,6 +159,7 @@
                   })
                   # base home manager settings
                   ({ ... }: {
+                    home-manager.backupFileExtension = "backup";
                     home-manager.useGlobalPkgs = true;
                     home-manager.useUserPackages = true;
                     home-manager.extraSpecialArgs = {