Creating pdf file of entire WordPress site

I’ve been asked to create a copy of a WordPress site on a disc. The site – wwwsaveourspire.org.uk – followed the restoration of an earthquake-damaged church spire. They want to include a copy of the site on a disc in a time capsule which will be placed in the rebuilt spire.

I haven’t a clue whether this is possible – or how to do it. I tried exporting the site as a multi-page pdf using Acrobat Pro – but this wasn’t very successful. Any ideas would be gratefully received. Thanks