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Arch/systemd/ghostmirror-monthly.timer

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+[Unit]
+Description=Monthly GhostMirror update timer (with Timeshift pre-backup)
+Documentation=https://github.com/vbextreme/ghostmirror
+
+[Timer]
+# 1st of every month at 03:00 local time
+OnCalendar=*-*-01 03:00:00
+# Catch up if the machine was off at the scheduled time
+Persistent=true
+# Spread load slightly so mirror servers aren't hit at exactly 03:00
+RandomizedDelaySec=15min
+Unit=ghostmirror-monthly.service
+
+[Install]
+WantedBy=timers.target