Parallels in Hamlet - using a 'Second'

Here's a short Hamlet/Bacon parallel:

Shake-Speare:

"...Therefore this project
Should have a back or second that might hold
If this did blast in proof".
   Hamlet 4.7.151-3

Bacon: "A man ought to have one thing under another, as if he cannot have that he seeketh in the best degree, yet to have it in the second".
   The Advancement of Learning

Comment:  The idea that a man should have a subsidiary plan in case his main plan fails, was probably not a commonplace. And note "second" in both passages. Chronologically Bacon could have borrowed from Q1 of Hamlet, 1603