These are the types of applications that I really love. It stores the data in a cloud service that already has enough free capacity for say a notes app. It's like how we can store pass(1) passwords on a git repository (Sync it with Github) and use that as the destination of Android Password Store[1], and you have a easy password manager that syncs across devices.

[1] https://github.com/android-password-store/Android-Password-S...