Right, I can see how this can work for audio, documents, videos and pictures, but what about my other files that need backing up that don't fall into any of these categories?
It doesn't matter... they're just files - put them anywhere... LinuxMCE will pick up any type of media regardless of which of those directories you put it in, by the way. So if you try to hide your music in your documents directory - it will still be found.
What happened to /home/public/data/other? I thought this used to be directory that was ignored by UpdateMedia just for this sort of thing... It doesn't have the links to the storage devices anymore.