Where is configuration stored?
By default its stored in the local browser cache. However if the property enableRemoteConfigServer is set to true during installation you can choose to store in a different location which is more convenient for you.
Do you provide data adapters to fetch / save configuration?
No we don't, you will need to provide the mechanism to store configuration in a remote location.
Can I preconfigure the Blotter?
Yes you can. You are able to build your own Adaptable Blotter Objects which are stored as Configuration. You are able to provide this configuration as a JSON object or as a URL (to a .JSON file).
Can I provide different configuration per user?
Yes, that is possible and expected. AdaptableBlotter.JS allows you provide highly configurable and personalised instances.