"How long should you assume a hard drive you are going to buy will last? The correct answer is to always have at least one backup and preferably two, keep them separate, and check them often一the 3-2-1 backup strategy. Every hard drive you buy will fail at some point—it could be in one day or 10 years—be prepared."-- https://www.backblaze.com/blog/how-long-do-disk-drives-last/