Are their any recovery SD images like the ones SP provides that would allow you to recover your BBB in the event you can't communicate with it or it gets damaged and you need to replace it?
I don't believe so, later S5s won't even have an SD card slot.
That's unfortunate since the BBB is essentially off the shelf. It would save a bunch of time if people could just swap the BBB instead of having to send the thing back to Bitmain.