As we use a cluster with hsphere, the disk usages are spread among different servers instead of at one server like with cpanel hosts. This is called the summary disk usage and it is used to calculate disk usage overages. If the account goes over the summary disk quota, it is then charged the plan's overage rate (if any). You can also increase your summary disk quota via the billing system.Charges for Traffic usages
If the plan charges for traffic overages, it will do so at the end of the monthly billing cycle per the plan's overages. You can increase the traffic via the billing system.