J.Larry:

Since version 2015, you can make a video of any BIAB song. Wouldn't that serve as "emergency backup"? If you just did your "favorite BIAB tunes" and put them on a tablet, you could still see the "chord changes in real time".

(The BIAB Help file says this:
"You can save your song as a video that you can upload to YouTube or work with in video programs. You can make a video for the Chord Sheet or the Notation window that shows the highlighted chords or notes moving as the song plays.")

Just a thought.
Good luck!
LLOYD S