Any bad habits that exist in the on-premises and virtual environments tend to come along for the ride with the jump to the cloud. The tendency to overprovision is one of them. Make sure your management and automation tools can help you visualize and utilize all of the capacity that exists in physical resources and in the virtual environment you've invested in (and worked so hard to develop). A private cloud that helps utilize your existing virtual capacity is oftentimes an organization's first foray into cloud computing. Again, when moving to the public cloud, new management and automation tools are often necessary.
Making the move to the cloud opens your systems to new security threats and data retrieval issues. System administrators should map out a contingency plan to back up and protect, as well as find a way to access all data when necessary.
For example, what if legal discovery becomes an issue for your organization and the organization's e-mail system or portions of the file archive is now running in the cloud? Who is responsible for discovery and what options will be available? Is your organization held legally responsible or is the cloud provider?
When data no longer resides on-site, it is important for companies to realize that steps must be taken to put a plan in place, with clear delineations of responsibility for data retrieval. Know your limitations, know your internal policy and know your legal obligations.