Actually, I think I figured it out. Turns out to be my mistake, plus some new info.
Firstly, I didn’t actually restart the server 
But when I did, it segfaulted. Found this post UrBackup Server doesn't startup after update to 2.5.26_1 on TrueNAS (FreeBSD) - #9 by azmawee and working on that now. Hopefully that resolves the issues.