Site URL:
(If you want to mirror an entire site, give the site's home page: http://www.foo.null/, to mirror a particular users files use the URL that user quotes as his home page eg: http://www.foo.null/~fred/, to mirror a particular collection of files only, give the start url for that collection, eg: http://www.foo.null/widgets/ for John's collection of widget information).
Prefix:
(If you want to mirror only Fred's files, and Fred has a link to the sites home page, this will result in the whole site being sucked up. To prevent this you can put a URL prefix which documents must have in order to be archived. eg: a prefix restriction of http://www.foo.null/~fred/ and a site URL of http://www.foo.null/~fred/ would prevent the archiving of http://www.foo.null and other links leading off from that on the same site, even if Fred has a link to it on his pages.)
Depth:
(0 is only inline images of the first page, 1 will get you a copy of all links referenced from that page, plus all the inline images referenced from them. If you put in a huge value, it will explore all links subject to the restrictions on prefix. It won't get stuck in recursion, it will notice that it has "been here before".)
Test: