

I’m particularly worried about all the historical records. Summoning Salt & similar channels are gonna have problems after this, especially after the policy has been in place for several years and stuff made in this very era expires.
I wouldn’t be surprised if Archive Team tries their best at archiving the current situation (difficult as it is) but nobody is going to bother doing it on-going and a WR obsoleted for months is interesting material only when edited into a documentary.
Borg or the like with ‘hardcoded’ plaintext/regularly full-disk-encrypted key is acceptable. Someone that has your unencrypted private key sitting on your server has almost certainly already obtained access to the entire set of data you’re backing up, with the backup key itself only meaningfully guarding access to older backups.
The more important thing is to securely keep extra copies in case the server fails. I keep mine in a group in my password manager, one per repo.