Error: InnoDB: Unsupported redo log format. The redo log was created with MariaDB 10.4.26. Please follow the instructions at http://dev.mysql.com/doc/refman/5.7/en/upgrading-downgrading.html

MySQL & MariaDB
4

Hi Leo,

Unfortunately, MariaDB has made some internal changes that make MariaDB not compatible with Percona XtraBackup for recent versions of MariaDB.

[Percona XtraBackup Overview - MariaDB Knowledge Base]
[Percona XtraBackup Overview - MariaDB Knowledge Base]

Luckily MariaDB provides its backup tool.
[Mariabackup - MariaDB Knowledge Base]

I hope this helps,

Pep

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