What are the emails precisely saying? Anyway, just put rclone on it and start downloading.
Data Hoarder
We are digital librarians. Among us are represented the various reasons to keep data -- legal requirements, competitive requirements, uncertainty of permanence of cloud services, distaste for transmitting your data externally (e.g. government or corporate espionage), cultural and familial archivists, internet collapse preppers, and people who do it themselves so they're sure it's done right. Everyone has their reasons for curating the data they have decided to keep (either forever or For A Damn Long Time (tm) ). Along the way we have sought out like-minded individuals to exchange strategies, war stories, and cautionary tales of failures.
Slowly. Sorry, not helpful. Hopefully someone has ideas
Build a NAS with 100TB and then start downloading. 90TB should take about 10 bays to download with a 1Gbit line. Although your ISP might get mad.