If you have data that you don't want to lose, it is best to back up your hard drive. You can back up your data by connecting a different hard drive to a computer, or you can use an external hard drive. It is also possible to transfer data to a cloud server. This is a safe way to back up your data because it is not on your computer. If you back up your data, you will be able to access it in the future if your computer crashes or your hard drive fails.