@huber70
Finally, someone to take
backup seriously. I wish I did take it as seriously as you!
VNC-viewer should, for security reasons, only be used inside your LAN.
If it's
just you that wants to use sftp it is not difficult.
If you want to give others sftp access, now that they can see (almost) all files on you Pi.
It is possible to restrict access, but that takes some more work setting it up.