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…
Edit: I'm not even considering running my own email server; I know that's a full-time job. Just something like forwarding my custom email to my Gmail address, which is the type of thing I've heard the aforementioned scary stories about (though a quick web search isn't turning up many such stories).