Cloud storage

Cloud Storage

Cloud storage is a model of data storage in which files are saved to servers located at a remote data centre, rather than on a local device such as a hard drive or SSD. Users access their stored data over the internet from any device with a connection. The physical storage within the data centre uses the same technologies covered elsewhere - magnetic hard disk drives and/or solid-state drives - but these are owned and managed by the cloud provider rather than the user.

Your device laptop/phone/PC Internet Data centre (HDD/SSD servers)

Data travels over the internet between the user's device and servers in a remote data centre.

Cloud Storage: Benefits and Drawbacks

  • Accessible anywhere: files can be reached from any device with an internet connection - at school, at home, or abroad. There is no need to carry a physical drive.
  • Automatic backup: data stored in the cloud is kept on the provider's servers, which typically maintain redundant copies. If a local device is lost, stolen, or damaged, the cloud copy is unaffected.
  • Scalable storage: users can increase or decrease storage capacity easily, often by upgrading a subscription, without buying new hardware.
  • Collaboration: multiple users can access, edit, and share the same files simultaneously - useful for group projects or businesses with remote workers.
  • No local hardware required: organisations do not need to purchase, maintain, or replace their own storage hardware; the provider handles this.
  • Internet dependency: cloud storage requires an active internet connection. Without connectivity, files cannot be accessed unless a local copy has been saved.
  • Ongoing cost: cloud storage is usually subscription-based, meaning costs continue indefinitely. Owning local storage involves a one-time purchase.
  • Privacy and security concerns: data is stored on third-party servers. Users must trust the provider to keep their files secure and private. Data breaches at the provider affect all users.
  • Speed limitations: upload and download speeds depend on the user's internet connection. Transferring very large files may be slow compared to local storage.
  • Data sovereignty: servers may be located in different countries, subject to different laws regarding data access and privacy.

 Key Takeaways

  • Cloud storage stores data on servers at a remote data centre, accessed over the internet.
  • The physical storage inside a data centre uses magnetic (HDD) and/or solid-state (SSD) technology - the same as local storage.
  • Key advantages: accessible anywhere, automatic backup, scalable capacity, supports collaboration.
  • Key disadvantages: requires internet connection, ongoing subscription cost, privacy concerns, speed limited by internet connection.