wget is a small non-interactive network retriever which is part of GNU project.
This simple, but powerful tool could be easily used to download a website to a local directory, building recursively all directories, getting HTML, images, and other files from the server to your computer:
wget -rkpNl5 www.sysadmin.md
-r – Retrieve recursively
-k – Convert the links in the document to make them suitable for local viewing
-p – Download everything (inlined images, sounds, and referenced stylesheets)
-N – Turn on time-stamping
-l5 – Specify recursion maximum depth level 5