get someone's back up vs get to

get someone's back up

verb
  • To annoy or anger someone. 

  • That joke really got my boss's back up. 

get to

verb
  • To affect adversely; to upset or annoy. 

  • To be allowed to. 

  • To reach or arrive at (a physical or abstract destination, or state of doing a certain activity). 

  • To intimidate. 

  • To go to or be located at (a particular place). 

How often have the words get someone's back up and get to occurred in a corpus of books? (source: Google Ngram Viewer )