Alternatively, you can also provide a custom implementation for defining the folder where data is stored in by implementing an ESLocationProvider and registering it at the org.eclipse.emf.emfstore.server.locationProvider extension point of the org.eclipse.emf.emfstore.server plugin.
From EclipseSource EMFStore Server Setup:
This could be used to provide a temporal workspace when testing, so as not to interfere with the default location.