If you choose to use public clouds for individual or business purposes, cyber security should be among the issues you need to think about at once. It all depends on the cloud platform you picked. Major public clouds (Google Cloud Platform, Microsoft Azure, Amazon Web Services) prioritize cyber security; they thoroughly monitor and analyze potential threats. For individual purposes, this could be enough provided that you take your cyber security seriously, are aware of current tools and practices, and care about your cyber hygiene. However, data breaches can happen in public clouds. And businesses should be much more cautious and boost cyber security in the cloud by the multi-level defence.