

Both of these work without you backing up anything manually. If you have a problem with Windows, you can use System Restore or a full factory reset to return to a prior point in time or reset your entire system. In other words, you should back up any file that you've personally created or acquired and want to keep. Key file types include documents, spreadsheets, presentations, photos and images, music, and videos. You only need to back up personal data files. Making a copy of every single file, folder, app, and other data is cloning your hard drive, which is a more involved process that's unnecessary for most people. When talking about backing up a computer, this don't necessarily mean the entire system.
