When facing a need to move a system, function or component to the Cloud; Infrastructure, Platform as well as to Software as a Service, Gartner has provided a model of five scenarios that usually apply as migration, in ordercof impact.
When seeing a migration through this lense, it’s wise to identify the capex versus opex spend for the scenario and the particular need. Considering that Revise might be the only scenario that does not require capital expense. On top of that, try also consider the long term total cost opex and capex together, if choosing another migration scenario. Beside that, I would find this model useful regardless of technology (realm) a migration targets. Not only cloud.