[Snapshot Pro] Custom S3 (Minio self-hosted S3)

I'd like to be able to use my own Minio self-hosted S3-compatible server. It's available at https://somethingsomethingsomething.something:9000/ and buckets are available as "directories" off the root, such as https://somethingsomethingsomething.something:9000/backupfolder – as opposed to amazon's bucket.something.com DNS-based naming.