run backup using rsync (see also archive and withbackupdevice)

backup

#!/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/backup-${DATE}.log

echo "starting " `date +%Y-%m-%d` | tee -a "$STDOUT"
# -n - preview
rsync -u -aAXv --delete --delete-excluded --exclude-from=/etc/backup_excludes /* /backup/current 2>&1 | tee -a "$STDOUT"
echo "done " `date +%Y-%m-%d` | tee -a "$STDOUT"