I don't know how I missed it before, but I found a great backup tool today.  It's BackupNinja.  It's stupidly simple to set up to back up a small number of machines.  It's no centralized backup system like bacula, but for a single server or two (like I have) it seems far better than a "roll your own" solution.

So, a big Christmas thank you to the BackupNinja devs.