I have quite a it of redundancy for my lyrics. In the first place, I probably do a thousand songs from memory.
Then I have all Lyric/Chord charts loaded onto the PA3X, and also on a USB thumb drive.
I also have them all on the laptop, plus they are posted in a file I can access via internet if it ever became essential. I could do this via phone if the necessity ever arose.
In addition, I have tons of PDF files on the laptop, showing melody lines, words and chords. I have used maybe two of them in the past five years or so.
When I quit using books, I was toting around a home-made wooden bookcase with 10 loose-leaf binders, and half a dozen fake books. It probably weighed more than any single piece of gear I have now!
DonM