Turns out my server is not down: the domain was allowed to expire and my content deleted.
I'm looking into a solution for my audio files, either on a new server or at Bandcamp. In the meantime, I'll start migrating my pictures to Google's Picassa.
I don't know whether edited posts are re-sent to subscribers or followers, but don't be surprised if you get a slew of old posts in your inbox!
This situation was caused by mis-communication which was out of my hands. Having to re-upload three years' worth of content is a royal PITA, but there is a positive side. It has served as a wake-up call and allows me to reorganize the blog to ensure this doesn't happen again.