Cloud Computing (CIE IGCSE ICT)

• Cloud computing is a method where data is stored on remote servers and accessed through the internet
• Local storage refers to a storage device that is connected to the computer

• The three types of cloud storage are: 
• Public Cloud - The customer and the cloud storage provider are different companies
• Private Cloud - The customer and the cloud storage provider are a single organisation
• Hybrid Cloud - Combines both public and private cloud options and allows for sensitive data to remain private whilst providing public cloud services for less sensitive information 
• Cloud data is duplicated and stored on other servers to ensure data availability during system failures, upgrades and maintenance periods

Advantages of Cloud storage

• Scalability
  • As the business requirements change the customer can scale services up or down to meet their needs
• Cost saving
  • Cloud storage eliminates the need for a business to purchase expensive equipment for infrastructure and maintenance which can result in significant cost savings
• Accessibility
  • Cloud services are available globally and allow both remote working and data sharing
• Reliability
  • Cloud computing providers offer high levels of uptime ensuring that services are always available for its users
• Storage Space
  • Cloud services can offer an almost unlimited amount of storage 
• Backup and recovery
  • If a customers machine or storage device fails, a backup of the data from the cloud will allow for recovery 
• File Synchronisation
  • Files can be synced across multiple devices
• Convenience
  • A user does not need to carry storage devices around with them as all data is stored on the cloud

Disadvantages of Cloud Storage

• Internet Connection
  • A stable internet connection is required to use cloud storage
• Security
  • Storing data in the cloud may be vulnerable to security breaches
• Dependency
  • The user is dependent on the storage provider for the availability and reliability of its services
• Ceases to trade/dissolve
  • Should the company dissolve or cease to change, all cloud data may be lost
• Cost
  • As the amount of storage or bandwidth required increases, the service may become expensive over time