diff --git a/hosts/dnsc-server/default.nix b/hosts/dnsc-server/default.nix
index 5753b25..a49fd7f 100644
--- a/hosts/dnsc-server/default.nix
+++ b/hosts/dnsc-server/default.nix
@@ -66,6 +66,7 @@
   # Home Manager Setup
   home-manager = {
     extraSpecialArgs = { inherit inputs outputs; };
+    backupFileExtension = "backup";
     users = {
       dennis = import ../../home/server.nix;
     };
diff --git a/hosts/dnsc-vps-sm/default.nix b/hosts/dnsc-vps-sm/default.nix
index e881de4..6bf5a44 100644
--- a/hosts/dnsc-vps-sm/default.nix
+++ b/hosts/dnsc-vps-sm/default.nix
@@ -81,6 +81,7 @@
   # Home Manager Setup
   home-manager = {
     extraSpecialArgs = { inherit inputs outputs; };
+    backupFileExtension = "backup";
     users = {
       dennis = import ../../home/server.nix;
     };