This is who we are:
https://www.rsync.net/resources/notices/canary.txt
We were the first provider to publish a Warrant Canary and it appears we're one of the few that still update it.
So, no.
No, we do not scan accounts for any purpose whatsoever.
Please review our extremely short and simple privacy policy:
https://www.rsync.net/resources/regulatory/privacy.html
... and do be in touch about the HN readers discount.
EDIT: rsync.net has, in the past, donated a lot of resources to Jason Scott and Team Archive for archival purposes just like you are describing. I am also, personally, a sustaining donor of Internet Archive. All of this to say: I am very interested in this archival work you are doing and would like to help support it - please do be in touch ...