If you are upgrading pre-3.23.26 versions, you should just lock the master tables, let the slave catch up, then run FLUSH MASTER on the master, and FLUSH SLAVE on the slave to reset the logs, then ...
A typical way of backing up data in a database server is retrieving a dump of the database(s). Depending on the update frequency and the criticality of the data, this kind of backup can be done, once ...
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