Automatically save and recover files
AutoSave, a feature that is available in Mac OS X Lion, saves your file automatically on a periodic basis. You can set how frequently files are saved. For example, if you set AutoSave to save every 5 minutes, you may recover more information in the event of data loss — such as from a power outage — than if it's set to save every 10 or 15 minutes. By default, AutoSave saves Office files every 10 minutes.
AutoRecover, a feature that is available in some Office applications, attempts to recover files automatically in the event of data loss. AutoRecover uses the same save interval as AutoSave.
Do not use AutoSave and AutoRecover as a substitute for regularly saving your files by clicking Save . Saving your files frequently is the best way to preserve your work.
Do any of the following:
Change how frequently files are automatically saved
Find an automatically saved or recovered file