How to download all Project Gutenberg English booksThis link talks about some ideas. But the question is from 2011.
From Project Gutenberg: How to get all ebooks.
PG: How to Mirror the site. They recommend using 'rsync', available for Linux and Windows.
PG: getting a certain file type (EPUB, HTML, MOBI, etc).
Ex: wget -w 2 -m -H "http://www.gutenberg.org/robot/harvest?filetypes=html"
Replace "html" with your filetype, which is one of these: epub.image, epub.noimages, txt, kindle.images, kindle.noimages, mp3 or html.
Or use wget and start with this URL: http://www.gutenberg.org/robot/harvest (most of these are zip files which contain txt files)
Download data to make a CD or dual-layer DVD. The most recent file is from 2010, so it's not updated often.
The list of PG mirrors. Very wide text format.