Someone wanted to code an add-on; unfortunately, this doesn’t seem to have gotten much traction:
Anki add-on to run the syncserver locally?
So far, I’ve been 100% desktop; planning on also using AnkiDroid occasionally.
I absolutely cannot upload any of my data to third-party servers 
I’m more or less a non-nerd; but I had absolutely no problems installing/running ‘Learning With Texts’ back in the day …
Would be soooooo cool if there was an add-on/built-in function to simply switch the syncserver on/off … 
Since I’m no network security wizard, I’d preferably use an ad-hoc WLAN without internet to avoid lurking hackers 
Of course, I could export/import; i.e. constantly copy back and forth, to and fro …
In for a penny, in for a pound … after whetting our appetite for local sync, couldn’t it be made so that everyone can easily use it, not just NSA-certified hackers …
Any help on the horizon?