There are cost savings to be found.
Except determining the exact amount is close to impossible.
Because the prices fluctuate, by design.
Similar to the Utility company pricing model.
Use lots of electricity get a giant bill.
Same with the Cloud.
And I did some tutorials on how it works.
The Public Cloud is based on IaaS and PaaS.
- Infrastructure as a Service - here you can host VMs in the Clould, either PreConfigured or you can customize however you like. You can load Business Objects, SharePoint, Databases, Webs, you name it, and it's not vendor software specific. You can spin up a VM for 1 hour, or 30 VMs for 1 hour and you are only billed for your time / usage. This is good for developers who need quick access to a VM bypassing their internal slowdowns waiting on people for approval.
- Provider as a Service - here you can host your web, storage, etc. in the Cloud, designed for new applications as porting existing webs is not always easy. For Microsoft, you must download, install and learn the Azure framework. There are ways to get your data into the Cloud, for Microsoft you can create SSIS package and there are some Wizards. You can not have a SQL Agent running in the Cloud as it must run local on your on-premise SQL-Server instance.
You can also have On-Premise Cloud infrastructure. This would be useful for large organizations who like to have same functionality as in the Cloud, yet more control and security by storing it on site.
There's also a Hybrid Cloud solution which blends Off Premise with On Premise Cloud infrastructure.
One issue that crops up quickly is the legal aspect of hosting your data in other country's. And sometimes these CLoud vendors go out of business and take your data with them. And another issue would be mashing data with on-premise data.
However, there will be a day, in the not too far future, where the majority of webs, data storage, etc. will be hosted on a Cloud platform.
Just need some adoption by the mainstream.
I think it's a radical change, almost as big as the client server to web transformation in the late 90's.