Why do we need an Database user and a Unix username when configuring the MySQL Server backup agent?

Why do we need an Database user and a Unix username when configuring the MySQL Server backup agent?
Best answer by Chris Hollis
BOL states: In the Database user box, type the user name to access the MySQL application.
If then states: If you are using a Linux platform, then in the UNIX username box, type the Linux operating system user name.
So you don’t need both, just one or the other depending on your environment/the archictecture MySQL is installed on.
Hopefully this helps!
Regards,
Chris
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