life savings vs preservation

life savings

noun
  • A large sum of money one has saved over a considerable number of years. 

preservation

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

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

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