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From what I read in the man page of pg_upgradecluster, there might be a typo in your command. Here is the synopsis from the man page: pg_upgradecluster [-v newversion] oldversion name [newdatadir] Either keep -v and explicitly add the new version number : pg_upgradecluster -V -v 14 13 main /srv/local/postgresql/data/14 or remove -v altogether (will default ...


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The protocol changes of MySQL-8.0 replication and some of its syntax aren't compatible with any Mariadb version. Recommend looking for options where both master and replica are the same version.


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Replication provides a "continual" backup. Zero downtime. You could stop the Replica to take the backup, but you don't have to touch the Primary. LVM provides a way to back up even a terabyte in a minute or so. Both of those require setup.


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