Registration is currently disabled because I have not yet set up email on the host where the site currently lives. Once I've set up outbound emails, we'll re-enable registrations.
Our hosting provider's SAN storage corrupted all data on the former web server virtual machine. Apparently we're not the only ones it happened to, so we're working to move away from this provider as quickly as possible: their SAN storage platform has simply proven to lack sufficient reliability for any serious use.
So yay, go backups. There were one or two configuration files we did not have up-to-date backups of, but fortunately those were easily re-created.
The icing on the cake was that our hosting provider tried to sell us their backup service when they told us that our dear web server virtual machine was beyond recovery. Offered to give us pricing and everything. Not good pricing, just pricing in general. How so very thoughtful of them. Never miss an opportunity to upsell, I guess; capitalism at its finest.