Postgres S3 Database Backup

Confused on what I'm doing wrong here. I am trying to backup my postgres database using the auto backup system to an S3 server. I am using Digital Ocean Spaces as the S3 server... I know the database URL is right. There has to be something wrong with the config of the bucket. Not sure what should be in each field. Can someone hold my hand on this? Here's a snapshot of my config. Because the digitalocean terminology is not 1:1 to amazon's, I must have something wrong.