preserve someone or something against something
to guard or protect someone or something against something. (Stilted or old-fashioned in reference to people.) I hope that the vaccine will preserve us against influenza. There is nothing in the jam to preserve it against spoilage.
preserve someone or something from someone or something
to protect or guard someone or something from someone or something. Please help preserve our people from the attacks of our enemies. Is there any way to preserve my skin against the harmful rays of the sun?
preserve something for someone or something
to save, maintain, or protect something for someone or some thing. Try to preserve some of these memories for your grandchildren. We learned how to preserve leaves for future reference.