> 1. Need to copy a site

A mirror is not a copy. It is a static snapshot in time, a collection of
files. There is no server side code or databases (asp, php, cgi, sql, etc.)
There is no server, forms will not work, most apps will not work.
If you need a copy you use the webmaster side, not the public side.

> 2. Transfer the data in a csv format including
> images 

This makes no sense. a csv is a text file, images are binary.

> 3. Upload them on a magento e-commerce site on
Not an HTT question.