Wget is a fantasitc tool. You need to create an offline copy of a site. No probem. Wget can help you make such copy easily:
wget --mirror --convert-links --adjust-extension --page-requisites --no-parent http://example.com
Shorthands:
wget -mkEpnp http://example.com
Clarification:
-m, --mirror shortcut for -N -r -l inf --no-remove-listing
-k, --convert-links make links in downloaded HTML or CSS point to local files
-E, --adjust-extension save HTML/CSS documents with proper extensions
-p, --page-requisites get all images, etc. needed to display HTML page
-np, --no-parent don't ascend to the parent directory