The tutorials section is very basic; I am not talking at that level. The patterns page is closer to the level of complexity that one needs help with, and it does cover several items, but you have 30-40 directives, many with several options, global options, and so on, so there're bound to be gaps.
In the other comment you said this is "90% of the feedback we get", and I can certainly understand the frustration -- people want documentation to magically solve their specific problem quickly, without having to read anything extraneous to it, which is clearly impossible.
As I said before, I'll keep it in mind next time I need to do something if I can't find it easily in the docs I'll at least highlight the effort it took, what I searched/read/found, etc., so you have something concrete.
deduplicating is fine, the question is what it will do on a restore.
As far as I can tell from searching the web, duplicacy will restore two (or more) hard linked files as separate files. (Apart from the obvious one of losing the connection, your restore directory takes more space than the original).
Restic (again searching, but this I can probably test since I use restic) will restore them properly -- i.e., preserving the hard link