This tutorial describes how to set up database replication in MySQL using an SSL connection for encryption (to make it impossible for hackers to sniff out passwords and data transferred between the master and slave). MySQL replication allows you to have an exact copy of a database from a master server on another server (slave), and all updates to the database on the master server are immediately replicated to the database on the slave server so that both databases are in sync. This is not a backup policy because an accidentally issued DELETE command will also be carried out on the slave; but replication can help protect against hardware failures.
http://www.howtoforge.com/how-to-set-up-mysql-database-replication-with-ssl-encryption-on-centos-5.4
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yes, the MySQL Client/Server Protocol is not encrypted by default. However, you can configure MySQL to either use SSL (see http://dev.mysql.com/doc/refma...s-ssl.html), or you could set up an SSH tunnel or any other encryption tunnel or VPN solution.