sharepoint 2013 storing data

Simple, SharePoint is a like a software, when you install & configure for use first time, it creates the required stored procedure and table in SQL and create a admin web portal.

From that admin web portal, you go and create multiple sites and below sites, you create list/ libraries for storing documents.

Admin can set the permission on each object of SharePoint (site, list/library, file/item).

You don't specify any data storage or retrieval for SharePoint. It does itself.

Now after the setup is done, you can build custom components which are deployable on SharePoint.

I am not sure what is your prototype project, but if you are running it on SharePoint, you can not do that until SharePoint is setup for user.

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Thanks, Ashish | Please mark a post helpful/answer if it is helpful or answer your query.