How do I backup my site/template before I customize it?

Well, at its most basic level (changing the text on the homepage) the homepage itself tells you where to look to do that.

I may as a last resort try it.

The book is meant to be a first resort and not last.

Vger

Here is what the front page says:

Congratulations! You have successfully installed your Zen Cart™ E-Commerce Solution.
Welcome Guest! Would you like to log yourself in?

This content is located in the file at: /languages/english/html_includes/classic/define_main_page.php

You can quickly edit this content via Admin->Tools->Define Pages Editor, and select define_main_page from the pulldown.

NOTE: Always backup the files in /languages/english/html_includes/your_template

I can't locate any of the three items referred to to do what it says.