create an archive using tar (see also backup and withbackupdevice)

archive

#!/bin/bash
set -e
cd /
if [ ! -f /backup/ready ]; then
  echo "backup device not ready"
  exit
fi

DATE=`date +%Y-%m-%d`
STDOUT=/var/log/archive-${DATE}.log

echo "starting " `date +%Y-%m-%d` | tee -a "$STDOUT"
tar -cvpzf /backup/fullbackup-$DATE.tar.gz --exclude-from=/etc/backup_excludes --exclude-backups --exclude-caches-all / 2>&1 | tee -a "$STDOUT"
echo "done " `date +%Y-%m-%d` | tee -a "$STDOUT"