Xtrabackup版本低，不支持備份MySQL8.0.20，提示Unknown redo log format (4).

備份時出現下面的提示html Unknown redo log format (4). Please follow the instructions at http://dev.mysql.com/doc/refman/8.0/en/ upgrading-downgrading.html. MySQL8.0.20的Release Note中有下面的提示：mysql InnoDB: Redo log

>>阅读原文<<