pengyou, you're correct, which is why I listed online storage as the last option in my original post.
I will not consider a third-party storage option simply because the trust factor makes it so dangerous. Even encrypted storage might be broken, if there was sufficient suspicion on the part of other people/agencies/governments.
You're argument, which I second, is that the 'net is simply not reliable in a crisis, of whatever cause, makes the most sense as a reason to avoid online storage of archives.
That being said, the only argument for online archives is as part of a multi-copy backup plan. You Might be able to get it back... Perhaps, Maybe...