I downloaded nearly the whole library when it was up with this program https://www.httrack.com/, I think it missed a few files but if anyone needs anything specific then post and ill put it up on yousendit or whatever.
The portion I've got (it looks pretty incomplete actually, all of Schumann is missing for a start) is 1.26GB. Compression doesn't seem to do much to PDFs. Edit: looking through it, a lot of stuff is missing. Won't be using that software again.