Within Office programs, you can enable Autosave to make sure your work never gets lost. 

To enable autosave:

• Open a new or existing document/presentation (Word, Powerpoint, Excel...)
• Ensure it is Saved to a location on your computer
  • If it is a new document, press File > Save As
• At the very top left, you will see this AutoSave icon. Make sure it is "On"