Latest Xtrabackup 2.4.7 doesn't recognise latest MySQL 5.7.18 InnoDB version

Had a similar same problem on the default Docker MySQL 5.7 image ( mysql :5.7).

Fixed by installing percona-xtrabackup-24 as it defaults to installing (installing percona-xtrabackup only installs 2.3.8)

Just in case someone else hitting this problem finds this.