diff --git a/operating-systems/buer/shepherd-services.scm b/operating-systems/buer/shepherd-services.scm
index 11cbd63..a31da28 100644
--- a/operating-systems/buer/shepherd-services.scm
+++ b/operating-systems/buer/shepherd-services.scm
@@ -39,7 +39,9 @@ next calendar event.")))
     (provision '(snapshot-/home))
     (modules '((shepherd service timer)))
     (start #~(make-timer-constructor
-               (calendar-event #:days-of-month '(1 15))
+               (calendar-event #:days-of-month '(1 15)
+                               #:hours '(8 14 20)
+                               #:minutes '(0))
                (lambda ()
                  (let ((btrfs "/run/current-system/profile/bin/btrfs")
                        (date (strftime "%Y-%m-%d" (localtime (current-time)))))