Hello! I like how you're thinking and fully agree with your stated goals & problems, so I want to try using Beam.
However, my main worry here is that where is my data? Local or/and cloud? What is the database format? How easy is it to access and backup?
The reason behind the worry being that I need to able to trust that I can access my data in the future if your app/service isn't alive anymore, or I don't want to pay for it anymore. (That's why I love using plaintext in everything where it makes sense, for example.)