All imported assets are stored in the Config library till your subscription is active. Further, in case you disconnect a HubSpot account from Config, assets imported from that account will still remain stored in your library.
All imported assets from any HubSpot account are stored in the Config library.
The library is repository of all your assets and modules, that contains information on everything that is imported.
Create modules
A module is combination of workflows, lists, forms, and email templates that can be clubbed together for a particular use case. When you deploy a module, all the assets contained within it get deployed together.