Where is configuration stored?
By default its stored in the local browser cache. However if the property enableConfigServer is set to true in Config Server Options 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 Config Basics. 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.