diff --git a/machines/morpheus/btrbk.nix b/machines/morpheus/btrbk.nix
index de8f470..0fc5524 100644
--- a/machines/morpheus/btrbk.nix
+++ b/machines/morpheus/btrbk.nix
@@ -22,6 +22,48 @@
         };
       };
       */
+
+      # local snapshots:
+      # - create hourly
+      # - keep hourly for 4 days and daily forever
+      home_local = {
+        onCalendar = "hourly";
+        settings = {
+          snapshot_preserve = "96h *d";
+          snapshot_preserve_min = "latest";
+          volume."/" = {
+            snapshot_dir = "/home/.btrbk";
+            subvolume.home = {
+              snapshot_create = "always";
+            };
+          };
+        };
+      };
+
+      # backup snapshots to backup drive
+      # - keep all hourly and the last 14 days of daily snapshots on the local disk
+      # - keep 14 daily, 8 weekly and all monthly snapshots on the backup drive
+      # - don't create new snapshots
+      # - TODO: trigger on mount
+      home_external = {
+        # disable systemd timer
+        onCalendar = null;
+        settings = {
+          snapshot_preserve = "*h 14d";
+          snapshot_preserve_min = "latest";
+
+          target_preserve = "14d 8w *m";
+          #target_preserve_min = "all";
+
+          volume."/" = {
+            snapshot_dir = "/home/.btrbk";
+            subvolume.home = {
+              snapshot_create = "no";
+            };
+            target = "/run/media/me/backup/morpheus";
+          };
+        };
+      };
     };
   };
 }