The hindsight-prescriptive comments here focus on backing up, and that's a sensible practice. But there was another kind of damage done here, to the man's identity, location and voice. His blog and his email address were his public persona. He used his blog and his address as identity, and as his channel of communication with followers, other artists, and I assume most of his general online communication. That person…
One thing I worry about thought: what happens when I die? My credit cards will eventually shut down, my Linode will turn off when my card gets declined, and my domains will fail to renew.
But the same thing happens the other direction. Github could shut down Github pages one day, or they could even go out of business. Geocities is gone (although I think Archive.org backed up a lot of it) and there are tons of services that have gone belly-up over the years.
Even in our age of massive data retention, it's still interesting to see what's gone, and what may never be recovered if it wasn't indexed by the Wayback machine.