Yes, Microsoft Copilot can access data stored on-premise if it is integrated via Microsoft Graph Connectors. These connectors make it possible to integrate external data sources into Microsoft Graph so that Copilot can use them. Further information on setting up and using Microsoft Graph Connectors can be found in the Microsoft documentation.
You can find out more about Microsoft Copilot and tips for authorization settings in our blog:“Microsoft Copilot – To-do list for permissions and access“.