Cloud services promise low cost-of-entry and rapid return on investment, but those advantages make it easy to overlook associated investments. To find out the true return on investment (ROI) of cloud computing enterprises have to dig deeper, according to a white paper from industry organization Information Systems Audit and Control Association (ISACA).
Calculating the total cost of an IT service against its potential return is always a challenge for IT staff, and that holds even truer for cloud computing, according to ISACA. A thorough analysis of cloud computing benefits must include short-, medium- and long-term views as well as termination costs, it said.
Hidden costs that enterprises may fail to anticipate when moving quickly to cloud-based services include the cost of bringing services back in-house due to regulatory change; unexpected expenses involved in the initial migration of systems; and lock-in with a specific provider or proprietary service model, according to ISACA.
To calculate investments needed to move a service back in-house - if new regulations or economic problems render the cloud impractical - enterprises have to take several factors into account. They include paying for extracting and validating data and the cost for recruiting IT resources needed to do the job.
Migrating to cloud-based applications and services also includes a number of different costs that need to be taken into consideration. Enterprises have to rewrite applications to operate in a virtualised environment and reformat data to suit software-as-a-service (SaaS) provider formats.
Enterprises also have to do their homework when it comes to the different cloud models that are available.
For example, they should consider if private, community or hybrid clouds would remove some of the security measures required for a public cloud, and whether choosing a platform-as-a-service or infrastructure-as-a-service over SaaS makes it more cost-effective to mitigate some of the lock-in risks.
Each alternative should be analysed to decide the most optimal cloud model for the circumstances, ISACA said.
Calculating cloud ROI is necessary to separate hype from reality, but enterprises should also be wary of making the process too complicated. Calculating ROI doesn't need to be that because it's only an estimate to support investment decisions, according to ISACA. Still, it is important to quantify the value of the return as much as possible and identify all potential costs when deciding to proceed with a cloud solution, it said.
The "Calculating cloud ROI: From the customer perspective" white paper can be downloaded from ISACA's website.
This isn't the first time this year ISACA has published tips on how to best take advantage of cloud services. Earlier this year the organisation presented the six key considerations it feels are necessary when rolling out enterprise cloud computing strategies.