All possible data tables in the Zammad REST/JSON api

I am trying to create a script that is capable of exporting the entirety of Zammad to spreadsheets that can be manually uploaded at any point in the future.

What are all of the possible data tables that can be exported from zammad through the REST/JSON api?

For example,

I would like to be able to export all of the tables, tickets, users…etc. The main reason being that we would like to not only be able to manually make changes to the data, but to have backups that can be reimported if we ever chose to use mysql over postgresql.

Better yet, is there a way to get into the zammad sql database?

Zammad does never, at any point, return all available information.
Your best friend in that case is pagination: Introduction — Zammad documentation