Are S3 backups working yet?

As of the other year when I looked into it S3 backups were borked unless you paid Amazon. Has this been fixed so S3 works with other providers such as MinIO?

I would really like to do S3 backups instead of rsync. So it would be great if S3 is now working.

See: Proposed Maintenance Guide Updates and Error messages for S3 Backup configuration are not particularly helpful