@Pathduck You are certainly right about me overthinking things...
I think I will lower my goals, and take the time to grab the files from my current machine and compare their content to the ones on my other one when I'll be there, and deduce some stuff.
Thanks for your references, as I feared, sources are way over me, or at the very least over the threshold of the time and efforts I'm willing to give for it. That and the fact my connection is super duper slow, so... 1.7Go is just...
The intention was truly appreciated though and certainly helpful, thank you ๐
Hmmm... I did not play enough with vivaldi://sync-internals, I'm very glad you pointed that out, that will help a lot getting a better understanding about what could and could not be done ๐