How to access /var/www/mastodon via sftp (like Cyberduck)

My YunoHost server

Generic Contabo VPS

YunoHost version: (stable)
I have access to my server : SSH | webadmin |
**vanilla YunoHost install

Description of my issue

Hi everyone! First let me thank you for creating YunoHost! It’s really easy and nice to use :slight_smile:

I’m hosting a Mastodon instance (who doesn’t these day, right :smiley:) and now I’m having the situation that I need to backup my instance.
The first issue I encountered is the following:

I want to access /var/www/mastodon either by ssh or sftp (via Cyberduck). So I can login to the machine by using my standard user. Problem: this user has permission to /var/www but not /var/www/mastodon. Only the user www-data has:

drwxr-xr-x 2 root root 4096 Nov 9 22:02 html
drwxr-x— 6 mastodon www-data 4096 Nov 10 09:31 mastodon

So on the shell I could do su www-data but then I get a password prompt. But I don’t know the password, and never set one during the initial setup, so I can’t access any files.

How can I achieve that?

Looking beyond that: I want to backup the whole server periodically (or some files/folders) to an S3-compatible object storage. What would be the best noob way to archive that?

Thanks in advance to anyone who can help me with my issues.

Kind regards,

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