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The platform bills backups with a monthly fixed cost and/or a cost for VM disk size in GB (in the platform). For example, if a customer has a VM with 50 GB of hard disk and is using a daily backup policy. If the price for the backup policy is $20 and the price per GB is $1 per GB, the customer will pay $20 + (50 * $1) = $70 per month. See Pricing Viewview
Note an upgrade to the Billing Integration is also required. Please contact Customer Service for more information