diff --git a/modules/nixos/server/kubevirt-hardware-configuration.nix b/modules/nixos/server/kubevirt-hardware-configuration.nix
index 4a9c02ef..2c05c672 100644
--- a/modules/nixos/server/kubevirt-hardware-configuration.nix
+++ b/modules/nixos/server/kubevirt-hardware-configuration.nix
@@ -18,13 +18,13 @@
     "${toString modulesPath}/profiles/qemu-guest.nix"
   ];
 
-  # backup only once a week inside all virtual machines
-  services.btrbk.instances.btrbk = {
-    onCalendar = lib.mkForce "Wed *-*-* 5:25:20";
-    settings.snapshot_preserve = lib.mkForce "7d";
-  };
-
   config = {
+    # backup only once a week inside all virtual machines
+    services.btrbk.instances.btrbk = {
+      onCalendar = lib.mkForce "Wed *-*-* 5:25:20";
+      settings.snapshot_preserve = lib.mkForce "7d";
+    };
+
     fileSystems."/" = {
       device = "/dev/disk/by-label/nixos";
       fsType = "ext4";