<p>I have a drobo box with five 2 TB drives. It appears as one drive to my desktop computer, but it distributes files and backups across the 5 drives so that if two drives stop working, I will not loose any files. All of my keepers are uploaded to my Smugmug account. For panorama and HDR photos, I upload the original components as well. This should work as long as I'm mentally competent enough to manage the system. For the several thousand family photos that are worth keeping beyond my lifetime, I am distributing them to as many family members as possible. </p>