If it is stored only on your computer, its not safe. Never, ever trust your computer to keep your important files safe. Hard drives fail, computers get stolen, they get lost, or damaged, and then your memories and personal items may be lost forever. Everything that you are not willing to lose needs to be backed up. Your photo's, MP3's, movies, etc, as well as any other info that you wish to keep. I have personally lost things in the past that are not replaceable.
With today's technology its so easy to backup your files onto CD's or DVD's and use DVD duplicators to make copies, whether it be one or many. For example, you may have a lot of MP3's that you want to share with your friends. Most electronic equipment actually drops in price over time, and technology continually changes, so its best to use a DVD duplication guide to keep abreast of changing prices and technology.
DVD and CD printers are a must for businesses, and also very useful at home. They vary from fully automated systems to small desktop models. There are many manufacturers to choose from. I love technology and watching things change over the years. I have seen a lot of changes in our world. Things we didn't dare to dream of when I was young, is now common.