There are a few different ways to backup computer files, and the safest way depends on your needs and preferences. One option is to use an external hard drive. You can either copy your files manually to the hard drive, or you can use backup software to automate the process. Another option is to use cloud storage. This is a convenient option if you need to access your files from multiple devices. You can upload your files to the cloud and then download them onto any device that has an internet connection.