You can get [name].openphoto.me account and link it with your dropbox. You upload photos to your openphoto account by dragging them into a window - but the files actually go to folders on your dropbox account. Hence - full control, backup ability and everything. Anybody (you, the FBI, a hacker) can delete your openphoto account tomorrow but you don't lose a single photo.
But, on the other hand anyone (you, the FBI, a hacker) can delete your dropbox account tomorrow and you'll lose all your photos. This just moves the problem.
Moves the problem in such a way that if you stop trusting Dropbox you can easily move your photos to another location without any disruption of the service.
Openphoto works like this (among other ways):
You can get [name].openphoto.me account and link it with your dropbox. You upload photos to your openphoto account by dragging them into a window - but the files actually go to folders on your dropbox account. Hence - full control, backup ability and everything. Anybody (you, the FBI, a hacker) can delete your openphoto account tomorrow but you don't lose a single photo.