Since your entire hard drive is likely to be much larger than the amount of storage you really need, you should be selective in the files that you choose for backup. In general, you can avoid backing up any programs that you can reinstall from a purchased CD, such as Microsoft Office (Word, Excel, etc.). Why pay for storage for "stuff" you can easily re-install? Try to focus your selection on things like your "My Documents" folder and data files of your important programs like accounting, income tax, contact management, graphics etc. Your online backup software comes with predefined filters, which allow you to automatically select categories of files without knowing where all the files are located. Check the Help or User Manual for information on Filters and how they can be used.