custody vs preservation

custody

noun
  • Temporary possession or care of somebody else's property. 

  • The state of being imprisoned or detained, usually pending a trial. 

  • The legal right to take care of something or somebody, especially children. 

  • An area under the jurisdiction of a custos within the Order of Friars Minor. 

preservation

noun
  • The act of preserving; care to preserve; act of keeping from destruction, decay or any ill. 

  • The state of being preserved, how something has survived. 

How often have the words custody and preservation occurred in a corpus of books? (source: Google Ngram Viewer )