Ask HN: What is a good multi-user solution for encrypted cloud data

I am currently looking for practical solution for the storage of sensitive data. It seems to me that the solution is not trivial taking the following requirements into account:

* the usage of a cloud provider (e.g. Google Drive or Dropbox) as a data storage platform.

* cryptographic protection (e.g. veracrypt) with decryption on the side of the client

* possibility of backups

Does anyone have some good practises or designs on how to build such a company internal system? We have access to servers, cloud providers, etc, but we do not want to spend much time in coding this ourselves.

Thanks!