diff --git a/hosts/vno3-nk/configuration.nix b/hosts/vno3-nk/configuration.nix
index 70fce72..4f9efc5 100644
--- a/hosts/vno3-nk/configuration.nix
+++ b/hosts/vno3-nk/configuration.nix
@@ -170,6 +170,13 @@ in
       btrfssnapshot = {
         enable = true;
         subvolumes = [
+          {
+            # next time: don't forget a subvolume /var/lib
+            subvolume = "/";
+            label = "hourly";
+            keep = 6;
+            refreshInterval = "*:00:00";
+          }
           {
             subvolume = "/data";
             label = "hourly";