I performed 6 to 7 days/nights a week for decades, and I carried a Bose L1 Compact, spare mics, spare cables, even a spare laptop. I had a complete, identical setup at home ready to go in the event of a catastrophic failure, which never happened. However, I did have an amp failure, once, and within five minutes, I replaced it with my spare and was back in business.
Like Abby, I had contracts, 50 of them, that had to be fulfilled, which was my legal obligation to my clients. When I was hospitalized, I made arrangements for someone to cover for me, which was spelled out in my contract.
I carried all my gear in my Dodge Grand Caravan with room to spare. If the van were to drop dead, I could fit all my gear in my wife's Buick and still go to work until the van was repaired - that never happened.
I have seen many of Abby's performances on You Tube, and his piano is an integral part of his overall performance. Keep in mind that not only is Abby a great musician, he is also a fantastic entertainer. He utilizes both the keyboard and piano to their fullest. Audiences see this and respond positively, which is why he is in demand. If his keyboard were to unexpectedly die on the job, I'm confident he could finish the performance using just his piano and vocals and the audience would be none the wiser.
In my case, most of my performances were just an hour long, sometimes two shows a day and on rare occasions, three performances a day. Therefore, I streamlined my setup, selected the lightest gear possible that would provide the highest quality sounds, which decreased my setup and tear-down time to just 7 minutes and I never broke into a sweat. Because I relied heavily on my vocals, if my keyboard were to die on the spot, I would be able to finish the job by just utilizing my laptop PC, prerecorded midi files, Van Basco's MIDI/Karaoke Player and my amp. The keyboard would be replaced as soon as I got home and primary board would go to the repair center the same day. In this instance, I was no different than the plumber with extra spigot washers in the truck, or the electrician with spare circuit breakers and wire on hand.
Home players and weekend warriors who do not rely on their equipment to make a living have far more flexibility and do not have to load and unload their equipment on a daily basis, which can be hard on sensitive electronic gear, especially arranger keyboards which have dozens of tiny plugs and multiple circuit boards. As a pro, musical entertainer, we must treat this as a business venture, with such additional expenses as backup equipment. Fortunately, our equipment is very reliable and failures are extremely rare.
Fortunately, Abby has been able to resolve some of his issues and work around others. Hopefully, he will not experience another freeze-up.
Good luck,
Gary