Arie,
I know Johan lives in Fort Knox 
, but,
Wasn’t part of the fun you don’t need to be on your LAN to download the saved files with the FTP Client app?
So, in theory, this howto should work for you, @Johanp, from anywhere, for as long as you are able to reach Homey with the mobile or web app;
It shouldn’t matter whether the files are saved to an FTP server on Homey, or to a local NAS.
I can acces my NAS with it, using the internet data connection:
