Saving in Word
Before writing a document in Word, follow these two important tips:
First, make sure autosave is enabled and set at a short interval (I recommend 1-5 min). Mac users: go to Preferences > Save > and check the AutoRecover box. PC users (Word 2007): click on the Microsoft Office Button, Word Options, and then Save. PC users (Word 2003): Go to Tools > Options > Save. If Word freezes or your computer crashes, the autosaved file should be there when you reopen Word.
Second, save your document before you start typing and do a manual save on your own every few minutes (you can do this easily by hitting CTRL-S on a PC or CMD-S on a Mac).