This time it wasn’t entirely unexpected: our old webhosting provider went out of business. I was planning to have a smooth transition to a new provider in the next week, but apparently someone shut the server down early. So much for that plan.
I’m going over the backups: I have a local copy of the site files themselves, but it looks like the forum databases are out of date. This is frustrating because I went to a lot of effort to set up daily backups, but it looks like the code on my local machine hasn’t been running properly. Lesson learned: test everything twice!
Will try to keep everyone updated here on the blog.
(Edit) Good news! The hosting company got the data center to agree to unlock the server, so no data will be lost. I’m arranging a new hosting provider now.