How to use cryptomator + cloud for air gap-ed files' backup

[Michael]

You really should read this and think about if cryptomator fits your needs. I assume: it does not.

What does Cryptomator protect me against?

Cryptomator was designed to solve privacy issues when saving files to cloud storages. The risk that the cloud provider or third parties access the data stored in the cloud without permission is mitigated. Only people who know the vault password are able to read the files in the vault or change the file contents undetected. This is true for file contents as well as for file names. To allow a working synchronization with the cloud, there are some meta information that Cryptomator does not encrypt…