No reference, absolutely, I don't want to accuse anyone of anything but as his(or anyone's) video/image/anything is now "in the cloud" I feel like there really

No reference, absolutely, I don't want to accuse anyone of anything but as his(or anyone's) video/image/anything is now "in the cloud" I feel like there really very little control over what we have there and what is not. Sure, they might be telling the truth that they deleted it, but can you be 100% sure that there have been no copies made? backups? OP mentions that he received an email, what about that? will it be deleted too? Any cached copies somewhere?