What is the use case of minio?
Typically server disks are much more expensive and turning it into s3 compatible storage doesn't seem like a good way of utilizing it.
Of course, you can also get these savings with an online service like Wasabi or Backblaze B2. I just feel that using S3 as your only storage is fine, but once you move to the budget options you need an external backup. So we are using Minio and backing up to Wasabi, and still saving a lot.
S3 is considerably simpler than SFTP or rsync over SSH on non-Unix-like platforms, which makes it a very interoperable API. Even Wordpress or a small Go service can implement S3 support without much effort or any extra dependencies. Being HTTPS-based, it can also be reverse proxied more easily because HTTP presents a Host header, unlike SSH.