Security is number one priority in cloud. Compared to the average data center, cloud security is both more rigorous and more strenuously monitored than a heterogeneous enterprise data center's security can be.
Amazon AWS has achieved ISO 27001 certification and has been validated as a Level 1 service provider under the Payment Card Industry (PCI) Data Security Standard (DSS). They also undergo annual SOC 1 audits and have been successfully evaluated at the Moderate level for Federal government systems as well as DIACAP Level 2 for DoD systems.
Microsoft's office 365 data centers are up to date with today’s ever-evolving industry standards and regulations.Microsoft services are verified to meet requirements specified in ISO 27001, EU model clauses, HIPAA BAA, and FISMA. Each certification means that an auditor has verified that specific security controls are in place and operating as intended.
First question for those who believe the cloud costs more is: over what time period? If the cloud allows you to avoid making a capital purchase, then it will almost always enjoy a demonstrable cost advantage in the short run.
But what about longer periods? This is an argument that needs a case-by-case comparison and is not possible to resolve in the general sense. But building on-premises infrastructure can be slow and expensive. There is expensive hardware that needs to be ordered, paid for, installed and configured - and all of this needs to happen long before you actually need it.
With Cloud Computing, you don’t have to spend time on these activities; instead you just pay for the resources you consume on a variable basis. Cloud Computing also helps you reduce your overall IT costs in multiple ways. Due to massive economies of scale and efficiency improvements Cloud providers continually lower prices.
Additionally, Cloud Computing drives down up-front and on-going IT labor costs and gives you access to a highly distributed, full-featured platform at a fraction of the cost of traditional infrastructure.
Cloud computing for the most part runs on AMD and Intel commodity servers running the operating systems most common to Intel's x86 instruction set, the basis for its Xeon family and other chips.
Consequently, it's possible to conclude that Windows Server and Linux are the operating systems that will dominate cloud computing for the foreseeable future. There are few solutions based on ARM or SmartOS but they are going to replace the predominant Windows and Linux anytime soon.
But ARM offers big power savings advantages for the cloud, while SmartOS offers advanced reliability and self-healing advantages. Neither system should be counted out.
It's no secret that new data centers are being built around the world to support mobile devices and cloud computing. Modern day data centers are designed to be carbon neutral and the cloud data centers achieve this combination of energy-efficient data centers, renewable energy purchases and high quality carbon offsets. This means cloud data centers are a “net zero” impact on the environment.