If you don't save your workbooks, you're playing a form of computerized Russian roulette. Your unsaved work is unprotected. If the power goes off or your system crashes, your worksheet is gone forever. Saving your work takes a few brief seconds and ensures that you or your colleagues will be able to open the workbook later. A saved workbook can be stored indefinitely.
When you save your work in Excel, you need to consider a few points:
The location of the saved file— You can save to your computer's hard drive or to a floppy disk. If you're working on a network, you can save your files to a drive and folder on the network.
The name of the file— The filename should be descriptive so that you or someone else can identify it. ...