Proxy-Workflow excludes audio files. Why?

Hi, I recently wanted to prepare some audio stuff from home for work so I copied the Library from the office to my mobile drive (just the proxy files). I made that using FCPX itself when copying. But at home I realized that the audio wren't copied, all video files were there but the audio not. Totally odd.

Is there any hint I missed?

Proxy playback is not really designed ASC an offline system. If you are making an offline library you have to manually copy off the standalone audio as well as graphics.