The textual information of all books ever written is around 10s of TB. So if the goal is to store all books for a rainy day, you can buy a grand of storage or

The textual information of all books ever written is around 10s of TB. So if the goal is to store all books for a rainy day, you can buy a grand of storage or you can build the largest library on earth. That said, a few books would be wise in case of severe energy loss (it would have to be very severe to make running something like a kindle prohibative, but if we're playing doomer then I'll accept a couple of shelves would be sensible).