When using Minitab Online you can save to OneDrive or Download a Copy to be saved locally on your computer. 

To Save to OneDrive:

Select File>Save a Copy

Enter a name for your project and select Microsoft OneDrive.

On the initial time saving you will be asked to sign in to OneDrive.  Sign in with your SU credentials.

Choose the location you would like to save the file and click Select

Your file will now be saved to OneDrive.  

Alternatively, you can click Autosave disabled at the top of the screen, name the document, and select OK to be prompted for the save location in OneDrive. 

To Save to your Computer:

Select File>Download a Copy

A copy of your file will be downloaded to your computer.  Please note the location will depend upon your browser and settings.