Sqllite is a local self contained file based database. It can handle persistancy.
I would stay away from Google as any type of middleman. They will not keep their services free and with time you will be at their mercy witj either them changing the underlying tech or having you pay a monthly fee for heavier data usage.
Better to just get a proper database for storing stuff online if your need external persistence mariadb or mysql are enough with a small php or python backend for db interaction.