[jFriedensreich]

googling for seedvault result: “Seedvault's app-specific restoration capabilities are limited, and it does not directly handle WhatsApp's chat backups, which must be handled by WhatsApp its” I am looking for filesystem level data control that can backup everything without relying on something in the control of an app developer.

[FireInsight]

I think it depends on the way applications store data. Local WhatsApp backups may be backed up by Seedvault, but not the database. I'm not sure to be honest, though. I'm so paranoid I also make app-level backups at regular intervals so that nothing breaks or is lost.