my idea is that it would even allow a life-sync, which would be an extension of the peer-to-peer Nextcloud Backup app.
As most of the code is already in this app, it would be great if that app could be extended or another app build upon it that helps in the following scenario:
- primary NC instance in your private LAN, you have all your files there and a bunch of apps running. There are files you don’t want to see be available from the www in case the NC instance get compromised.
- secondary, public, NC instance, which is located in your DMZ or hosted by NC itself or whoever. This contains files and apps you want to access when you are away or share with others. It could be a read-only clone of your primary NC but with reduced content. You may want friends to upload things as well or change e.g. tasks in the task app using the secondary NC, so it would be welcome if sync would two way.
Based on the description of nextcloud/backup: Backup now. Restore later. (github.com) I dare to say that would be feasible reusing most of the code of this app.