Save results and assumptions (and formatting, copulas, charts, ...) you entered by clicking the save button of the action bar.
It will display a progress bar while the data is saved inside the server's disks.

By default, Mind saves the result of a run. But if you want not to save the results you can do it by Shift + clicking on the save button.
Automatic Save after a Run
From version 4.2.1, a new option is available in Project Settings to automatically save your model at the end of a run. You can access it in the settings panel:

Please note that this setting can be overridden for each run, by triggering this switch before starting the calculations:

Once the run is over, your project and its results will be saved automatically.