The best way to provide protection for your images is to make multiple copies stored in more than one location. The main reason for this is due to the simple fact that over time, you are very likely to experience a hard drive failure. When it happens, you stand a good chance of losing everything that was on that hard drive. If you rely upon only a single hard drive for programs and images, you are asking for the the worst case scenario. By using more than one back up scheme, you minimise your risk of losing images and maximise your protection!
Since 1976, I have built 7 computers. I built most of them with multiple hard drives for the purpose of maximizing the protection of my data and backing up programs. I found that it didn’t matter which brand of hard drive you used, all were susceptible to breakdowns due to the mechanical nature of the beasts. Each computer I built had at least one hard drive fail during its lifetime (most hard drive failures occurred about 3 to 5 years after their installation) but not all the drives failed. The drive that failed most often was the drive that the operating system and programs were on. By using more than one drive and keeping all data on a separate drive from the programs and operating system, I built in a natural form of protection into each computer.
With the cost of large drives these days, it is tempting to put in a large drive and assume that you will have everything at your finger tips, but it is a mistake to not have some form of backup protection (preferably using an external drive or service). Relying upon a RAID configuration for your drives can be beneficial, but even those do not guarantee protection of your images. The only way to provide complete protection for them is to use more than one back up source. I tend to use 4, including one that is cloud based and one on removable media (DVD or CD), and 2 different external hard drives. In this manner, I am reasonably assured that my images are protected from loss.