This site has been build with a nice product called Nanoc. This is a Ruby package, designed to help build static websites (although part of the content may be dynamically generated, the final content is static).
Several things happened during that forced migration:
I stopped using RadiantCMS as my main CMS to move to Nanoc. Again, I liked RadiantCMS but I do not need most of its features and running a full-fledged Rails application just for some pages is too much.
My old website was running at home behind an ADSL connection (6 Mbps down / 1 Mbps up) so I replaced it by my other FreeBSD machine hosted by the Online hosting company.
Of course, I had to move over my DNS, IMAP and SMTP server as well but that was rather easy, most of it was already installed.
The machine hosting this, my blog and a couple of other things (like a friend’s site — Terre Seconde) has been moved over to a more comfortable Dedibox dedicated server hosted by Online.net. FreeBSD 9.2 at the moment (to be moved to 11 soonish), full ZFS-on-root of course. Everything is done in jails too.
It used to be an oldish Dell 2950 1U server hosted by the Free Foundation, with a couple of Pentium3 CPU and 1 GB of RAM. This is now a 64-bit machine hosted by Online with 2 4 TB disks, all encrypted and with ZFS.