How do you back up Nextcloud, installed as a snap, using the Backup app? - eviltoast

I have Nextcloud installed as a snap. I would like to back it up to a folder on a separate drive within the server. Nextcloud appears to have an official backup app, which I have installed on the Nextcloud instance.

Is it possible to connect a folder on a separate drive to Nextcloud running as a snap? What permissions should such a folder have?