UPDATE 12/31: While the data all looks good, I'm getting force close errors. I can't see anything in BackupGoo's logs indicating a problem, so I surmise the issues lies with a Java 6 / Yosemite compatibility issue. As a work around, I've loaded up a virtualized Mavericks installation and have set up BackupGoo there.
Bottom line - under Mavericks, BackupGoo has been a tremendous Google Apps backup solution, but given the lack of communication regarding support of Yosemite, I would think twice before committing.
After receiving no word from BackupGoo "support", I finally dug in and figured out why BackupGoo wasn't working on my newly upgraded OS X Yosemite machine. Turns out that I need an older version of Java, available at http://support.apple.com/kb/DL1572. Thanks to the venerable OS X Daily website for the direction.
I imagine other users of Java-based applications will have similar issues with Yosemite, so maybe this post will give you something new to try.
For those of you unaware, BackupGoo was my fairly inexpensive Google Apps backup solution. It has worked well aside from this hiccup, but I am extremely dissatisfied with the lack of support. This was an easy fix and I'm sure I'm not the only one facing the problem. If anyone has a good alternative for backing up Google Apps data, please post below!