@ryanfb the IA cli actually allows with ease to get bulk metadata and torrent files. But, the api called, is on the same domain, so down now.
They offer torrent for single items, would be better to have it for full collections. The good old rsyncd or zsync http://zsync.moria.org.uk/ could also be enough.
(I have just read Jason Scott on X, the problem is failed frontend server)