I haven’t covered this enough: thanks to Alex Hornung, it’s possible to create a HAMMER volume and have it be encrypted. Matthias Schmidt has done just this, and has provided an rconfig(8) script to automate the process. (Or to crib from if you prefer to do it by hand.)
A running description of activity related to DragonFly BSD.
Lack of encryption was main blocker for backup solution based on DragonFly BSD. It seems like small improvement, but in reality it’s huge selling point.
Next on my wishlist would be support for Xen DomU or acceleration for KVM guest. That is the best trojan horse for pushing a new operating system into an organization right now.