Comments - Percona XtraBackup Overview
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If you are getting errors like this
while using XtraBackup with MariaDB 5.5 or higher, you most likely need to upgrade XtraBackup to a 2.1.7+ version. See more details in the bug report. Also, please note that the last comment there of 2014-01-06 about multiple XA engines can be easily misunderstood. The problem can appear even if you are not using any other XA-capable engines.