Earlier quoted context omitted.
It would be a nice exercise but relying on it doesn't make sense to me. We had to write a text editor in our first semester of our CS undergrad program. I'm not going to use my own text editor in favor of say MS word or Google doc.
Your data is secure on b2, it's simply an interface. Code is on github. DB should be dumped and saved to b2 daily. Not really unreliable.
Depending on contracts with an employer, there might be legal hassles as well.