You didn't say how much space was needed, but many people have next to nothing on their machines. Copy whatever is appropriate onto as many family/friends machines as possible. Also 1TB drives are very cheap, store copies offsite with those.
Whatever you do, keep it as simple as possible (e.g. no RAID). Reevaluate things every 5-10 years to be sure whatever medium you use isn't becoming obsolete/unreadable.