Previously, all backups on Amazon S3 storage providers were uploaded using the S3 Standard storage class. This class is designed for frequent access and includes a level of redundancy not required for backups. It’s possible to use lifecycle rules to change the storage class after uploading, however Amazon doesn’t allow you to change the storage class of an object for the first 30 days.
We’ve now added a dropdown for Amazon S3 storage providers allowing you to choose which storage class you’d prefer to use. For an overview of the different classes that are available, you can see Amazon’s S3 Storage Classes doc.