You can save an existing local map to SharePoint or a Web location.
Click the File tab , and then click Save As.
In the dialog, navigate to the location where you want to save the map, and enter a File name.
Click Save.
The map is saved to the server. It remains locked until you close it. You can continue to work on the map and save it when you are finished.
If you are using a SharePoint server, you may want to check out the map while you continue to work on it.