Also, I need similar service for my EBS volumes - you would trigger backup of the EBS volume on set schedule and you would purge old backups as needed, AWS will

Also, I need similar service for my EBS volumes - you would trigger backup of the EBS volume on set schedule and you would purge old backups as needed, AWS will bill me for storage and bandwidth directly while you will bill me a fixed sum for each volume (as you have no variable costs in this picture).