Imagine you had 72 hours before everything collapses. How would you spend that time? Would you stockpile supplies? Would you focus on warning as many people as possible? Would you try to preserve knowledge, like books, hard drives, download internet archives, etc.? Would you collect music or history?
Rent an isolated cabin far out in the woods, buy anything I can think of that would help me last indefinitely out there, get enough supplies for the short term, then pack it all in the truck and gtfo with my cat in the passenger seat.