I have a firewall that’s running FreeBSD 4.11. I’m planning to upgrade to 5.4 tonight. The backups are running (via Bacula [of course!]) now.
I installed 5.4 on a separate HDD a few weeks ago, but have not copied over the configuration files etc. I’ll have to do that tonight.
I’ll be documenting what is required and post it on The FreeBSD Diary.