Script to backup a remote directory to your local QNAP storage

backupRemoteDirToQnap.sh

#!/bin/sh

# Script to periodically synchronize a remote directory with your
# local QNAP storage.

# Source folders/user on remote machine
BACKUP_SOURCE_USER="backup-user"
BACKUP_SOURCE_HOST="backuphost.example.com"
BACKUP_SOURCE_FOLDER="/backup/subdir"

# Directory to save the remote backup locally
BACKUP_SINK_FOLDER="/share/MD0_DATA/Qmultimedia/backup-dir"
# For grepping the available space
BACKUP_SHARE_MOUNT_POINT="/share/MD0_DATA"

SUBJ_PREFIX="[RSYNC BACKUP]"
SUBJECT_FAIL="${SUBJ_PREFIX} Synchronization unsuccessful!"
SUBJECT_SUCCESS="${SUBJ_PREFIX} Synchronization successful!"

MAIL_TO="hansi@example.com"
MAIL_FROM="hansi-machine@example.com"

MSG_CONTENT_FILE="/tmp/email_body.txt"
RSYNC_CONTENT_FILE="/tmp/rsyncContent.txt"

# Sends a mail message
# $1 = subject
# $2 = to
# $3 = from
# $4 = msg
send_mail()
{
   local tmpfile="/tmp/sendmail.tmp"
   /bin/echo -e "Subject: $1\r" > "$tmpfile"
   /bin/echo -e "To: $2\r" >> "$tmpfile"
   /bin/echo -e "From: $3\r" >> "$tmpfile"
   /bin/echo -e "\r" >> "$tmpfile"
   if [ -f "$4" ]; then
      cat "$4" >> "$tmpfile"
      /bin/echo -e "\r\n" >> "$tmpfile"
   else
      /bin/echo -e "$4\r\n" >> "$tmpfile"
   fi
   /usr/sbin/sendmail -t < "$tmpfile"
   rm $tmpfile
}

/bin/echo -e "Backup started at: $(date)\n" > ${MSG_CONTENT_FILE}
/bin/echo "Space available on backup disk (before backup)" >> ${MSG_CONTENT_FILE}
/bin/echo "$(df -h | head -n1)" >> ${MSG_CONTENT_FILE}
/bin/echo "$(df -h | grep ${BACKUP_SHARE_MOUNT_POINT})" >> ${MSG_CONTENT_FILE}
/bin/echo -e "\n" >> ${MSG_CONTENT_FILE}

/bin/echo -e "The following output was produced by the rsync command:\n" > ${RSYNC_CONTENT_FILE}
/usr/bin/rsync -azhv ${BACKUP_SOURCE_USER}@${BACKUP_SOURCE_HOST}:${BACKUP_SOURCE_FOLDER} ${BACKUP_SINK_FOLDER} >> ${RSYNC_CONTENT_FILE}

if [ $? -eq 0 ]
then
  SUBJECT=${SUBJECT_SUCCESS}
else
  SUBJECT=${SUBJECT_FAIL}
fi

/bin/echo -e "Backup ended at: $(date)\n" >> ${MSG_CONTENT_FILE}
/bin/echo "Space available on backup disk (after backup)" >> ${MSG_CONTENT_FILE}
/bin/echo "$(df -h | head -n1)" >> ${MSG_CONTENT_FILE}
/bin/echo "$(df -h | grep ${BACKUP_SHARE_MOUNT_POINT})" >> ${MSG_CONTENT_FILE}
/bin/echo -e "\n" >> ${MSG_CONTENT_FILE}

/bin/cat ${RSYNC_CONTENT_FILE} >> ${MSG_CONTENT_FILE}

send_mail "${SUBJECT}" "${MAIL_TO}" "${MAIL_FROM}" ${MSG_CONTENT_FILE}