Comments - configure mariabackup
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I'm not sure what that specific package is. The official Mariabackup package is not called that. See here for instructions on installing Mariabackup:
https://mariadb.com/kb/en/library/mariabackup-overview/#installing-with-a-package-manager
Regardless, yes, you can install Mariabackup on a Galera Cluster node without breaking anything.