@huber70
First let's try the "unsafe" method.
You remember your huber.freemyip.com url you setup for calibre-web?
Now let's use this for sftp as well.
In your router (fritz!box) make a portforward for port 22 (extern) to port 22 (intern) [I would use something like external port 22123 instead of port 22 but....it's your party] just like you did for calibre-web.
In FreeFileSync do not connect to 192.168.xxx.xxx but to huber.freemyip.com and use port 22 [or 22123 !!!].
User is the same as you use for internal sftp as is the password.
Does this work?
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