diff --git a/makefu/4lib/default.nix b/makefu/4lib/default.nix
new file mode 100644
index 000000000..5e9ab2087
--- /dev/null
+++ b/makefu/4lib/default.nix
@@ -0,0 +1,30 @@
+{ config, lib, ... }:
+
+with lib;
+let
+  addDefaultTime = bku-entry: recursiveUpdate {
+    snapshots = {
+      daily    = { format = "%Y-%m-%d"; retain =  7; };
+      weekly   = { format = "%YW%W";    retain =  4; };
+      monthly  = { format = "%Y-%m";    retain = 12; };
+      yearly   = { format = "%Y";                    };
+    };
+    startAt = "5:23";
+  } bku-entry;
+
+  backup-host = config.krebs.hosts.omo;
+  backup-path = "/media/backup";
+in {
+  bku = {
+    inherit addDefaultTime;
+    simplePath = addDefaultTime (path: {
+      method = "pull";
+      src = { host = config.krebs.build.host; inherit path; };
+      dst = {
+        host = backup-host;
+        path = backup-path ++ config.krebs.build.host.name
+                           ++ builtins.replaceStrings ["/"] ["-"] path;
+      };
+    });
+  };
+}