Backing up site along with files with wget

I'm trying to backup a podcast website with wget since the author is leaving. It's not copying the mp3 files down to my hard drive any idea of the proper syntax I need to use. I've tried the below options and they don't copy all the files:

wget --no-clobber --convert-links --random-wait -r -p -E -e robots=off -U mozilla http://ift.tt/1AhXrLA

wget -A pdf,jpg -m -p -E -k -K -np http://ift.tt/1AhXrLA

wget -A pdf,jpg,mp3 -m -p -E -k -K -np http://ift.tt/1AhXrLA