Can I disable the local cache in YouTube Integration Essentials to save storage at my server?

Yes, just deactivate "show the microdata" and "show the title" in your ACP
and the local cache will be disabled automatically. YouTube will be contacted
to provide the thumbnail image at each YouTube embed in your forum. In this
case the privacy of your visitors won't be protected but you save database and
file storage at your server. Note, that significant speed improvement will
still be provided, since the YouTube player will still only be loaded if
someone clicks to see the video.