diff --git a/helios/external-backup.sh b/helios/external-backup.sh
new file mode 100644
index 0000000..964f516
--- /dev/null
+++ b/helios/external-backup.sh
@@ -0,0 +1,211 @@
+#!/bin/bash
+#
+# Script zieht per rsync Backups und rotiert Backup-Verzeichnisse
+#
+# https://www.heinlein-support.de/howto/backups-und-snapshots-von-linux-servern-mit-rsync-und-ssh
+#
+# Zusammengeführt und angepasst durch Tobias Strobel (2021)
+#
+
+RDIFFEXIT="$(mktemp)"
+GOTIFYURL="https://push.strobeto.de/message?token=Anks7VaBnyf7jCB"
+HCBACKUPURL="https://hc.strobeto.de/ping/375f20ea-aaa7-4b34-b279-bafc3ff55fed"
+HCROTATEURL="https://hc.strobeto.de/ping/f169adf0-a1b3-4823-8fb6-f3a63546bb42"
+
+SERVER="$(hostname)"
+
+# ### Konfiguration
+# Sollen wir pruefen, ob noch ein gewisser Prozentsatz
+# an Plattenplatz und Inodes frei ist?
+HDMINFREE=90
+
+# Welcher Pfad soll gesichert werden?
+SRC_PATH=/
+
+# Unter welchem Pfad wird gesichert?
+DATA_PATH=/mnt/backupone
+
+setLED () {
+	# Set LED status
+	echo heartbeat > "/sys/class/leds/helios64:blue:usb3/trigger"
+	echo 1 > "/sys/class/leds/helios64:blue:usb3/brightness"
+}
+
+clearLED () {
+	# Clear LED status
+	echo usbport > "/sys/class/leds/helios64:blue:usb3/trigger"
+	echo 0 > "/sys/class/leds/helios64:blue:usb3/brightness"
+}
+
+finishUp () {
+	# Clean up tempfiles
+	rm "$RDIFFEXIT"
+	
+	sync -f $DATA_PATH
+}
+
+healthchecksStart () {
+	# $1 Healthchecks URL
+	curl -fsS -m 10 --retry 5 -o /dev/null "$1"/start
+}
+
+healthchecksFinish () {
+	# $1 Healthchecks URL
+	# $2 Status Code
+	# $3 Logs
+	curl -fsS -m 10 --retry 5 --data-raw "$3" "$1"/"$2"
+}
+
+notify () {	
+	# $1 Action
+	# $2 Last command succeeded
+	# $3 Custom Title
+	# $4 Custom Message
+	# $5 Custom Priority
+	NOTIFY_TITLE="[$SERVER] "
+	NOTIFY_MESSAGE=""
+	NOTIFY_PRIORITY=1
+	case "$1" in
+
+		rotate-start)
+			NOTIFY_TITLE+="Rotation started"
+			NOTIFY_MESSAGE="Rotation on external hdd started"
+		;;
+
+		rotate-end)
+			if [ "$2" -eq 0 ]; then
+				NOTIFY_TITLE+="Rotation finished"
+				NOTIFY_MESSAGE="Rotation on external hdd finished"
+				NOTIFY_PRIORITY=5
+			else
+				NOTIFY_TITLE+="Rotation has ERRORS"
+				NOTIFY_MESSAGE="Exit code $STATUSCODE. See logs attached to healthchecks for more information."
+				NOTIFY_PRIORITY=8
+			fi
+		;;
+
+		backup-start)
+			NOTIFY_TITLE+="Backup started"
+			NOTIFY_MESSAGE="Backup to external hdd started"
+		;;
+
+		backup-end)
+			if [ "$2" -eq 0 ]; then
+				NOTIFY_TITLE+="Backup finished"
+				NOTIFY_MESSAGE="Backup to external hdd finished"
+				NOTIFY_PRIORITY=5
+			else
+				NOTIFY_TITLE+="Backup has ERRORS"
+				NOTIFY_MESSAGE="Exit code $STATUSCODE. See logs attached to healthchecks for more information."
+				NOTIFY_PRIORITY=8
+			fi
+		;;
+		*)
+			NOTIFY_TITLE+="$3"
+			NOTIFY_MESSAGE="$4"
+			NOTIFY_PRIORITY="$5"
+		;;
+	esac
+
+	curl "$GOTIFYURL" -F "title=$NOTIFY_TITLE" -F "message=$NOTIFY_MESSAGE" -F "priority=$NOTIFY_PRIORITY"
+}
+
+checkFreeSpace () {
+# Pruefe auf freien Plattenplatz
+GETPERCENTAGE='s/.* \([0-9]\{1,3\}\)%.*/\1/'
+KBISFREE=$(df /$DATA_PATH | tail -n1 | sed -e "$GETPERCENTAGE")
+INODEISFREE=$(df -i /$DATA_PATH | tail -n1 | sed -e "$GETPERCENTAGE")
+
+if [ "$KBISFREE" -ge $HDMINFREE ] || [ "$INODEISFREE" -ge $HDMINFREE ] ; then
+	echo "Fatal: Not enough space left for rotating backups!"
+	logger "Fatal: Not enough space left for rotating backups!"
+	exit
+fi
+}
+
+basicChecks () {
+	if ! [ -d $DATA_PATH ] ; then
+		echo "Fatal: Data path does not exist: $DATA_PATH"
+		logger "Fatal: Data path does not exist: $DATA_PATH"
+		exit
+	fi
+
+	checkFreeSpace
+
+	# Ggf. Verzeichnis anlegen
+	if ! [ -d $DATA_PATH/"$SERVER"/daily.0 ] ; then
+			mkdir -p $DATA_PATH/"$SERVER"/daily.0
+	fi
+}
+
+rotate () {
+	echo "Rotating snapshots of $SERVER..."
+	healthchecksStart $HCROTATEURL
+	notify rotate-start
+
+	# Das hoechste Snapshot abloeschen
+	if [ -d $DATA_PATH/"$SERVER"/daily.7 ] ; then
+			rm -rf $DATA_PATH/"$SERVER"/daily.7
+	fi
+
+	# Alle anderen Snapshots eine Nummer nach oben verschieben
+	for OLD in 6 5 4 3 2 1  ; do
+			if [ -d $DATA_PATH/"$SERVER"/daily.$OLD ] ; then
+				NEW=$($OLD + 1)
+			# Datum sichern
+			touch $DATA_PATH/.timestamp -r $DATA_PATH/"$SERVER"/daily.$OLD
+					mv $DATA_PATH/"$SERVER"/daily.$OLD $DATA_PATH/"$SERVER"/daily."$NEW"
+			# Datum zurueckspielen
+			touch $DATA_PATH/"$SERVER"/daily."$NEW" -r $DATA_PATH/.timestamp
+			fi
+	done
+
+	# Snapshot von Level-0 per hardlink-Kopie nach Level-1 kopieren
+	if [ -d $DATA_PATH/"$SERVER"/daily.0 ] ; then
+			ROTATELOG=$(cp -al $DATA_PATH/"$SERVER"/daily.0 $DATA_PATH/"$SERVER"/daily.1; echo $? > "$RDIFFEXIT")
+	fi
+	
+	STATUSCODE=$(cat "$RDIFFEXIT")
+	
+	echo "Finished rotating backups of $SERVER..."
+	healthchecksFinish $HCROTATEURL "$STATUSCODE" "$ROTATELOG"
+	notify rotate-end "$STATUSCODE"
+}
+
+backup () {
+	# Los geht`s: rsync zieht ein Vollbackup
+	echo "Starting rsync backup from $SERVER..."
+	healthchecksStart $HCBACKUPURL
+	notify backup-start
+
+	BACKUPLOG=$(rsync  -avz --numeric-ids -e ssh --delete --delete-excluded   \
+			--include={"/mnt/storage/nc_data","/mnt/storage/media","/mnt/storage/backup"} \
+			--exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found","/.snapshots"} \
+			$SRC_PATH $DATA_PATH/"$SERVER"/daily.0 \
+			; echo $? > "$RDIFFEXIT")
+			
+	STATUSCODE=$(cat "$RDIFFEXIT")
+	
+	# Rückgabewert prüfen.
+	# 0 = fehlerfrei, 
+	# 24 ist harmlos; tritt auf, wenn während der Laufzeit
+	# von rsync noch (/tmp?) Dateien verändert oder gelöscht wurden.
+	# Alles andere ist fatal -- siehe man (1) rsync
+	if ! [ "$STATUSCODE" = 24 ] || ! [ "$STATUSCODE" = 0 ] ; then
+		echo "Fatal: rsync finished $SERVER with errors!"
+	fi
+
+	# Verzeichnis anfassen, um Backup-Datum zu speichern
+	touch $DATA_PATH/"$SERVER"/daily.0
+
+	echo "Finished rsync backup from $SERVER..."
+	healthchecksFinish $HCBACKUPURL "$STATUSCODE" "$BACKUPLOG"
+	notify backup-end "$STATUSCODE"
+}
+
+setLED
+basicChecks
+backup
+rotate
+finishUp
+clearLED
\ No newline at end of file