Internet Servers are charged transmission costs by the owners of the pipelines connecting them to the Internet itself.
In ARCON's situation there are three connectors to guard against one or two 'going down' or becoming unavailable.
These connection companies charge for the amount of data sent to the servers.This is to safeguard you from the costs of success.That is if your site is extremely popular and a large number of people pull information from your site to their browsers, there is no cost.
But if you or your customers either download data to your server there is a charge after you exceed the 'Transfer Allowance per Month'
This allowance also takes into account the amounts of email you receive on behalf of your account.