Motivation:

• You are using on-premises virtual servers and storage for your services.
• You wonder whether you should move your services to public cloud, such as AWS or Azure or Google Cloud, in order to reduce hardware and maintenance cost.

Suggestions:

1. It is common that cloud resources for system running 24/7 are much more expensive than private resources.
   
   
2. Cloud resources are suitable for 
   • a very big system that needs to be run only once within limited time, or
   • startup with many consolidated services on single small virtual server, or
   • testing purpose, or
   • a very big company with big budget who want reliable and elastic resources.