If your work isn't autosaving it is likely due to it being set to be an open text document which cannot be auto-saved. It needs to be changed to a docx.

Step 1:

Open up Word and click on File

Step 2:

Open options at the bottom of the screen 

Step 3:

This opens up a window. Click on save.

Step 4

Change the "save files in this format" to Word Document (*.docx)

It is the same proccess in both Powerpoint and Excel.