nightbook on "[Plugin: BackWPup Free - WordPress Backup Plugin] Cannot connect to MySQL database"

Hello,

I'm finding the following errors when I execute a manual backup;

[27-May-2015 19:01:51] 1. Try to backup database …
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): The server requested authentication method unknown to the client [mysql_old_password]
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): (HY000/2054): The server requested authentication method unknown to the client
[27-May-2015 19:01:51] ERROR: Cannot connect to MySQL database 2054: The server requested authentication method unknown to the client
[27-May-2015 19:01:51] 2. Try to backup database …
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): The server requested authentication method unknown to the client [mysql_old_password]
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): (HY000/2054): The server requested authentication method unknown to the client
[27-May-2015 19:01:51] ERROR: Cannot connect to MySQL database 2054: The server requested authentication method unknown to the client
[27-May-2015 19:01:51] 3. Try to backup database …
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): The server requested authentication method unknown to the client [mysql_old_password]
[27-May-2015 19:01:51] WARNING: mysqli::real_connect(): (HY000/2054): The server requested authentication method unknown to the client
[27-May-2015 19:01:51] ERROR: Cannot connect to MySQL database 2054: The server requested authentication method unknown to the client
[27-May-2015 19:01:51] ERROR: Step aborted: too many attempts!

Any thoughts,
Thanks

https://wordpress.org/plugins/backwpup/