Or something like that...
Keep a record of your important uploads. I have two copies of every potential CH avi I've ever made.
Yep, that's how it works for something like a free forum site. And if something happens to the image on the host site, it won't show up on the site where it is showing.
This particular idea will not be allowed because there would be no way to prevent someone from uploading an inappropriate picture. Of course, the user will be banned if done so, but what if...you know?