I completely agree with @lingareddy_Alva on the costing part. One small point I would like to mention is We should only enable SPOT instances (60-90% cost savings) in Development/non-critical(PROD) environment. This option works great and is indeed cost effective but not good for mission critical workloads. I used this for one of my daily load and sometimes the process terminates abruptly. @lingareddy_Alva please correct me if I am wrong here.