Cloud backup is a service in which the data and applications on a business’s servers are backed up and stored on a remote server. Businesses opt to back up to the cloud to keep files and data readily available in the event of a system failure, outage or natural disaster.
The backed up files, applications, virtual machines or servers are stored safely on a remote network of computing resources that you access via the internet. 'The cloud' refers to that network of connected computer resources.