Here lies the problem: it will not be fast.
Every single restore we did in the past years required a long time to correct small glitches. No data has been lost, but full system operations were restored hours later.
Hotsync is not maintaining its promise and @flatspin confirms our experience.
I’m the one who started the development of hotsync and I must admit that now I think that it’s not suited for a modular product like NethServer.
I think it’s “unfixable”. I’ll try to support anyone who wants to maintain it, wishing him “good luck”.