During the month, you can use all the resources you need to build and maintain your website (disk space, addon domains, subdomains, parked domains, email accounts). Once you reach day 30, we will create an invoice based on the resources used on that exact day.
Example: You open your account on the 5th of the month. Between the 5th and the 28th of the month, your disk space usage is 30 GB. However, you made adjustments, and on the 5th of the next month, your new disk space usage is 20 GB. This means we will create your bill for 20 GB instead of the 30 GB used during the whole month. Fair enough?