The AutoRecover feature is not a substitute for manually saving your work by clicking Save . Regularly saving the file is the surest way to preserve the work that you have done, but sometimes a Microsoft Office program closes before you can save changes to a file that you are working on. Some possible causes include the following:
A power outage occurs.
Your system is made unstable by another program.
Something goes wrong with the Microsoft Office program itself.
You close your file without saving it.
Although you cannot always prevent problems such as these, you can take steps to protect your work when an Office program closes abnormally.
Keyboard shortcut To save a file, press CTRL+S.