Cloud Services (XaaS)

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Infrastructure as a Service

Infrastructure as a Service (IaaS) is the foundation of cloud computing. Rather than purchasing or leasing space in an expensive data centre, labour, real estate, and all of the utilities to maintain and deploy computer servers, cloud networks and storage, Cloud buyers rent space in a virtual data centre from an IaaS provider.

They have access to the virtual data centre via the Internet. This type of cloud computing provides the “raw materials” for IT, and users usually only pay for the resources they consume, including (but not limited to) CPU cores, RAM, hard disk or storage space, and data.
All true Cloud providers allow users to “rent” virtual servers and storage while creating networks to tie them all together. When renting from a cloud IaaS provider, users are renting the hardware and the provisioning software that automates it.

Software as a Service

Software as a service (SaaS) is a model for the distribution of software where customers access software over the Internet. In SaaS, a service provider hosts the application at its data centre and a customer accesses it via a standard Web browser.

There are a few major characteristics that apply to most SaaS vendors:
  • Updates are applied automatically without customer intervention
  • The service is purchased on a subscription basis
  • No hardware is required to be installed by the customer
  • Software as a Service is also known as hosted software or on-demand software.

Platform as a Service

Platform as a service (PaaS) is a concept that describes a computing platform that is rented or delivered as an integrated solution, solution stack or service through an Internet connection.

The solution stack may be a set of components or software subsystems used to develop a fully functional product or service, such as a web application that uses an OS, web server, database and programming language. More generically, the solution stack may deliver an OS, middleware, database or application.

Backup as a Service

Backup as a Service (BaaS) is an approach to backing up data that involves purchasing backup and recovery services from an online data backup provider.

Instead of performing backup with a centralised, on-premises IT department, BaaS connects systems to a private, public or hybrid cloud managed by the outside provider.

Desktop as a Service

Desktop as a Service (DaaS) is a form of virtual desktop infrastructure (VDI) in which the VDI is outsourced and handled by a third party. Also called hosted desktop services, desktop-as-a-service is frequently delivered as a cloud service along with the apps needed for use on the virtual desktop.

A Desktop as a Service provider typically handles storing, securing and backing up a user’s data, as well as upgrades for the DaaS service and supported applications.

Disaster Recovery as a Service

Disaster Recovery as a service (DRaaS) is a cloud computing and backup service model that uses cloud resources to protect applications and data from the disruption caused by a disaster. It gives an organisation a total system backup that allows for business continuity in the event of system failure.

DRaaS is often offered in conjunction with a disaster recovery plan (DRP) or business continuity plan (BCP).  DRaaS is also known as business continuity as a service (BCaaS).