Theoretically it's possible if ALL of them got hit, but all servers on the block chain maintain a complete copy of the whole thing and there are hundreds of them worldwide, so in theory, only one need survive. However if that happens? Your blog is the last thing you'll be worried about, and your crypto may be on a short list of priorities that might have to wait a bit for recovery if possible. You will likely have 3 days to live or find means of survival in the event of a widespread event like a war scale EMP that obliterates enough of the block chain to raise this concern, so don't sweat it.