@markus1204 Ahhh, I knew it would be something simple… 🙂
Run du -h --max-depth=1 /images/ on your FOG server to get a listing of the images’ size.
As well check out this post: https://forums.fogproject.org/topic/15501/request-dev-branch-web-ui-show-how-much-space-an-image-takes-up-on-the-server