Synology Surveillance Station USB storage archive workaround cron job

synology_surveillance_usb_archiver.sh

#!/bin/bash

# Synology Surveillance Station doesn't let you store recordings on USB storage, which means that you must
# use the internal (often mirrored) disks. This is less than ideal. Unfortunately, just symbolically
# linking the surveillance store directory to one on USB storage causes surveillance station to fail after
# a day or so. This workaround still uses your main storage for recording, but moves older files to USB storage
# for archival. The moved files themselves are symbolically linked back to the original storage location.
#
# Script should be run regularly, either by editing /etc/crontab or through Synology's built in script scheduling.
# Be sure to edit the user inputs below, and set up SS to keep recordings for longer than the external archive period.
# 
# I run in via cron with this entry in my /etc/crontab:
# #minute hour    mday    month   wday    who     command
# 49      *       *       *       *       root    /volume1/synology_surveillance_usb_archiver.sh >>  /volume1/synology_surveillance_usb_archiver_log.txt

# *********** BEGIN USER INPUTS ***********
# source directory where you store your surveillance footage
SOURCE="/volume1/surveillance"
# desination directory where you which to archive surveillance footage
DEST="/volumeUSB1/usbshare1-2/surveillance"

# media at least this many minutes old will be moved to external storage
MINS=1440
# archives at least this many days old will be purged permanently.
EXT_ARCHIVE_DAYS=14
# *********** END USER INPUTS ***********

echo "**************************"
date

if [[ ! -e $DEST ]];then
	mkdir $DEST
fi

# process any new recordings
echo "Looking for new recordings to move..."
for SUBDIR in `find $SOURCE -mindepth 1 -maxdepth 1 -type d`
do
#	echo "Processing $SUBDIR"
	DIRNAME=`basename $SUBDIR`
	for MEDIA in `find $SUBDIR -mindepth 2 -maxdepth 2 -mmin +$MINS -type f -name '*.mp4'`
	do
		FILENAME=`basename $MEDIA`
		DATE_PATH=`dirname $MEDIA`
		DATE_NAME=`basename $DATE_PATH`
		echo "     Processing media: $FILENAME for camera $DIRNAME on $DATE_NAME"
		SUB_DEST="$DEST/$DIRNAME/$DATE_NAME"
		echo "     Moving $MEDIA to $SUB_DEST"
		mkdir -p $SUB_DEST
		mv $MEDIA $SUB_DEST/
		ln -s $SUB_DEST/$FILENAME $MEDIA
	done
done
echo "DONE"

echo

# now purge archives
echo "Looking for old archived recordings to purge..."
for MEDIA in `find $DEST -mindepth 3 -maxdepth 3 -mtime +$EXT_ARCHIVE_DAYS -type f -name '*.mp4'`
do
	echo "     Removing $MEDIA"
	FILENAME=`basename $MEDIA`
	DATE_PATH=`dirname $MEDIA`
	DATE_NAME=`basename $DATE_PATH`
	CAM_PATH=`dirname $DATE_PATH`
	CAM_NAME=`basename $CAM_PATH`
	echo "     Removing $FILENAME from $DATE_PATH"
	rm $MEDIA
	LINK_DIR="$SOURCE/$CAM_NAME/$DATE_NAME"
	echo "     Removing link from $LINK_DIR"
	rm $LINK_DIR/$FILENAME
done
echo "DONE"

echo

# now purge empty directories
echo "Looking for empty recording directories to purge..."
for MDIR in `find $SOURCE -mindepth 2 -maxdepth 2 -type d -empty -name '20*'`
do
	echo "     Removing empty source dir: $MDIR"
	rmdir $MDIR
done
for MDIR in `find $DEST -mindepth 2 -maxdepth 2 -type d -empty -name '20*'`
do
	echo "     Removing empty archive dir: $MDIR"
	rmdir $MDIR
done
echo "DONE"

date
echo "**************************"

Thank you for sharing.