Because Google Docs saves to a secure, online storage facility, you can create documents, spreadsheets and presentations without the need to save to your local hard drive. Your presentation will begin saving within Google Docs almost as soon as you begin entering text. However, you also have the option of manually saving your presentation, which you can do by clicking File > Save.
You can save and then close your presentation by clicking the Save and close button in the upper-right corner of the screen.
Once your presentation is saved, it will be accessible from your Docs list.
In addition, you can save a copy of your presentation to your local computer by clicking File > Download as. From here, you can export your presentation as a PDF, PPT or Text file.