I asked for a data dump via email, waiting to hear back. Ripping it all out is going to cost someone a pretty penny since it's hosted in AWS, better to ask someone to fill and ship some SATA drives. Then off to the Internet Archive!
Looks like its part of the public dataset program so you can probably just ask for the bucket name and get full free access to everything.
https://registry.opendata.aws/smithsonian-open-access/
Enjoy! I’m personally very excited about this dataset, and couldn’t be more impressed with the people, mission, and, well, everything at the Smithsonian.
Source: I work on the AWS Open Data team / had a small role in this (normal lawyerspeak caveats apply that my views and opinions are my own)
[1] https://www.si.edu/OpenAccess
Jed or jeffbarr, what say ye?
aws query on the open dataset comes back with:
Total Objects: 4649789
Total Size: 312.5 TiB!