How is AWS Backup pricing determined?

(1) The amount of storage you use

(2) The service being used

Explanation

With AWS Backup, you only pay for the storage you use in your backup activity. AWS Backup storage pricing is based on the amount of storage your backup data consumes. 

Different services are priced differently, so the pricing is unique to each service. The storage amount billed in a month is based on the average storage space used throughout the month.