Sorry if it was not clear: The NAS is at my house but houses may burn down. THE discs are at my parents house for off-site backup. Like the sibling poster says, I would be the one going through the things anyway. But if unsure you can also ask a friend to keep them, one blu-ray can hold tons of photos and doesnt take much space.

Fair. Nothing is risk free. Move overseas, be more than 10 days away, other sibs have the burdens "we threw out those old unreadable backups Dad had stashed from his time at the computer center".. But your strategy isn't the worst by far. My 3-2-1 has 2 of the 3 in the same physical location. Not good.