wget --wait=0.2 --random-wait --no-check-certificate --page-requisites -erobots=off --tries="inf" -c --user-agent="Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0" -i /path/to/list_of_urls.txt
wget -r --wait=0.2 --random-wait --no-check-certificate --page-requisites -erobots=off --tries="inf" -c --user-agent="Mozilla/5.0 (Windows NT 6.1; WOW64; rv:41.0) Gecko/20100101 Firefox/41.0" http://principalhand.org
Note: These commands are appropriate for backing up a personal website. Otherwise, check the site's terms of service first.