Does the iWeb domain file store my pictures within it?

I only wonder because I want to keep a backup of my iWeb projects in case my computer fails. I haven't been able to buy a new hard-drive to backup my entire computer via time machine. So would simply copying the domain file be sufficient enough? Would I lose my pictures stored on my site if my computer fails and all I have is the Domain file?

I really need to get a bigger hard-drive for time machine, but until then, I'll have to store my important projects on a small (80GB) external Hard-Drive.

Thanks.