Your account comes with a limited amount of resource like disk space and data transfer. The amount of resource allocated to your account depends on the level of your account.
Caution
It is very important to keep your account from using all of the allocated disk space at all time. Many programs will cease working properly when there's not enough disk space.
When logging in to SiteManager, you will see the amount of allocated disk space and data transfer. You can also see more details about your resource usage on menu.