How does Geodatabase Manager license services, and what different functionality is enabled by the different Esri license options?
Geodatabase Manager is licensed on a per-machine basis. Multiple services can run on a single machine with one license, and those services can be any preferred combination of reconcile and posting services. If a second machine is needed to handle the volume of work to be performed by Geodatabase Manager, a separate Geodatabase Manager license will be required for the second machine.
Although Geodatabase Manager allows the user to select from ArcGIS for Desktop Advanced, ArcGIS for Desktop Standard, and ArcGIS Engine with Geodatabase Editing, all three licenses provide the full functionality needed for Geodatabase Manager.