Earlier quoted context omitted.
I know this, you know this, and OP has for damned sure just realised this, as has anyone else who's read this post. What the purpose of your comment? It's not helpful.
Many people have a naive trust of free services. If your livelyhood/business depends on uploaded files, do not trust Facebook, Youtube, Gmail, Google docs, etc to store it forever. I think it's important to mention that such trust is misplaced and risky, ALWAYS make backups. Sure it's generally common sense for many, but the OPs story is a nice example.
I don't think that that's particularly true of HN readership though.
If GP's comment was on a more mainstream forum e.g. Reddit, then I would agree with you, but as it stands it feels a bit gratuitous.