No Longer Maintained. Current versions of ComputeStacks rely on the included mariabackup within the existing mariadb container.
See: https://mariadb.com/kb/en/library/mariabackup-overview/
This image, unlike other similar container images, is designed to startup and run detached (using runinit) and have the mariadb volumes mounted to /data.
When it's time to perform a backup, execute: docker exec -i <container> mariabackup <options>
Note: This is designed to work in conjunction with the ComputeStacks backup agent.