Case So Bad, Jury Excused From Service...
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No best answer has yet been selected by Shinishi. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.The words can often be used more or less interchangeably, but there are times when one is more appropriate than the other.
You can preserve something merely by making sure it does not change. This can sometimes be done for historical reasons, for example, preserving an old building because it has architectural merit or because it gives us an insight into how people lived in days gone by. Preserve is generally used when referring to things.
Protect is often used when referring to a person, as in, protect someone from harm or disease, although it can refer to things too, as in, to protect wood from weathering by using varnish.
I hope this hasn't added to your confusion!