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MySQL 8.0 Reference Manual  /  ...  /  Group Replication Upgrade with mysqlbackup Group Replication Upgrade with mysqlbackup

As part of a provisioning approach you can use MySQL Enterprise Backup to copy and restore the data from a group member to new members. However you cannot use this technique to directly restore a backup taken from a member running an older version of MySQL to a member running a newer version of MySQL. The solution is to restore the backup to a new server instance which is running the same version of MySQL as the member which the backup was taken from, and then upgrade the instance. This process consists of:

Repeat this process to create a suitable number of new instances, for example to be able to handle a failover. Then join the instances to a group based on the Section, “Group Replication Online Upgrade Methods”.`