@allann I will attempt to address those questions:
1. Can PostgreSQL be installed on Google Cloud SQL instance?
So as stated in the documentation you linked we only offered instructions for setting up a standalone DB on Windows. A quick search indicates that Google Cloud SQL offers PostgreSQL as an option but you and your organization would be responsible for the database.
2. Is there documentation/recommendation for disaster recovery/high availability for PostgreSQL?
We do have instructions for database replication and failover though again these instructions assume a Windows deployment and there may need to be other steps or considerations taken for a cloud deployment of the database.
Additionally, if you are concerned with HA you may wish to read up on creating a failover node in Qlik Sense
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