Backup files first to your PC's hard drive, and then to a trusted friend. Cucku Backup is a free and easy way for you to protect all of your data. We all know we should back up our data but few of us actually do it. When we do backup, it is usually to an external hard drive, CD or DVD. It is easy to lose a CD or DVD, and an external hard drive is just as likely to be stolen or damaged along with your PC.