Script run as a cron task that launch backups creation and upload created backups to an OpenStack Swift container, after having deleted every backup older than a week old. Place the scripts creating backups in /etc/backup. If you want the backups directory to be cleaned first, create a script named like "00_clean.sh" that does that.

backup.sh

#!/bin/bash -e

# Log in error log
1>&2 echo "--- `date -Is` ---"
# Log in output log
echo "--- `date -Is` ---"

if [ "$#" != "1" ]; then
	1>&2 echo "Usage: backup.sh HOST_NAME"
	exit 1
fi

hostname=$1

# Export OpenStack auth environment variables
source /home/brendan/openrc.sh

d=`date +"%Y%m%d"`

echo "Running backup scripts..."
sudo run-parts --arg=$hostname --arg=$d /etc/backup

cd /var/backups

echo "Uploading backups..."
openstack object create backups $hostname/*-$d.tar.gz > /dev/null

echo "Checking if there are backups older than a week old for this host..."
backup_files=`openstack object list backups -f value --prefix $hostname`
one_week_ago=`date -d "1 week ago" +"%Y%m%d"`
backups_to_remove=""

for f in $backup_files; do
	fdate=`echo "$f" | rev | cut -d"-" -f1 | rev | cut -d"." -f1`
	if [[ $fdate -lt $one_week_ago ]]; then
		backups_to_remove="$backups_to_remove $f"
	fi
done

if [ -n "$backups_to_remove" ]; then
	echo "Deleting all backups but the ones from the past week (sliding window)..."
	openstack object delete backups $backups_to_remove
fi

echo "Done!"