This tweet warms my librarian heart. It's always a good idea to keep emergency books around. Hurricane season is upon us here in Texas, and I'm always careful to keep a supply of print books to enjoy if the power goes out for a few days.
(More seriously, I have expressed to my library director that, as a matter of collection development policy, it should be possible to rebuild human civilization from the print collection of any library. This saved some unread volumes from disposal.)