"The GSMA has been claiming that an A5/1 Rainbow Table will need the equivalent of a tower of books 20km high, which is about as useful as saying that such a table couldn't be written on a fish."
Coincidentally, that's how I back up my data... But I prefer two towers for redundancy (I've got a colocation arrangement with Saruman). Backing up the video collection isn't so good, you lose a bit in the conversion/compression algorithms. Most of my vids fit onto one page:
"Dave the plumber enters the house, some music starts playing and all plumbing interests divert to the biological type"
The alternative was printing out each frame with subtitles, but that would require 4 towers.