If by the end of the billing month your average summary disk usage exceeds summary disk usage limit, you are charged usage (overlimit) fees.
If you increase your summary disk usage limit, every month you will be charged recurrent fee which is usually less than usage fees.
Article ID: 815, Created: March 15, 2011 at 3:07 PM, Modified: April 8, 2011 at 1:08 PM