[PROBLEM] Where is my SSH private key so i can use it to login Xbian via FileZilla?

[gkusiak]

My -possibly incorrect- understanding of FileZilla is that you need the manager software on the "server"...which would imply client software on your xbian machine.
Samba has been part of kodi for...ever, or close to it IIRC. there are also addons for kodi that let you watch from various sources, including NAS/similar (Plex? emby? Jellyfin?)

I seem to think you may be making your life more difficult than it needs to be - I'd say that things are probably already in place for what you're hoping to accomplish. I've embraced the "everything is available" mindset and subscribed to RealDebrid- why pay for local storage when you can basically watch anything anytime from somebody else's cloud?