backup_lvm: Switching to container based setup
Duplicity as natively installed setup might be restricted by package management and alike from the host OS side. This usage of a container based setup will provide more flexability with upstream providers for Backups. Concret: One major issue with CentOS 7 was the installation of the b2sdk without messing up the hosts python installation. Therefore running it in a container seems like a good solution as all hosts have container engines installed anyway.
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