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Library Genesis, which also includes scientific articles and provides storage for sci-hub, provides a large series of dataset dumps as torrents, http://libgen.io/repository_torrent/

There are occasional torrents, AFAIK. Hope you have 10tb of free space handy.

It is absolutely mind blowing to me that you can purchase that amount of storage with 20% to spare for around $500 these days. 12TB, $498 : http://www.amazon.com/Red-Desktop-Hard-Disk-Drive/dp/B00LO3K...

Or around $120 if you just want to archive the data and use tape:

http://www.tapeandmedia.com/quantum-lto-6-tape-ultrium-tapes...

The drive isn't cheap though, but tape is still the cheapest media for long-term archival storage.

I don't think that's feasible -- scihub requests articles directly from publishers (using legit accounts). Each requested article is cached by libnet.io, so articles are not re-requested twice