Cloud is a visible mass of condensed water vapor, typically high above the ground. Imagine your data floating around?
However, Cloud Telephony is the term used to describe your calls supported via the Internet. Usually under a per user/per month charging basis.
Cloud Telephony is supported by three or four vast data storage centres anywhere in the UK. Storage Centres are found in remote areas protected and patrolled by security guards.
The Centre’s are a replica of each other, holding exactly the same data to support each other should one fail.
In the event of a Catastrophic Failure e.g. power failure, fraud or third party there will be no break in service. In fact you will not be aware of any issues.