>>> That's one reason to put it under your home (personal, user)
>>> directory. Normally, your TeX distribution will define a "user"
>>> directory, where you can put stuff that is "just yours". In your
>>> case, it's like to be something like /Users/stefan/texmf/, but I
>>> don't know for sure, as I too am not on Mac. But if that were right,
>>> then you could put your bib files in /Users/stefan/texmf/bibtex/
>>> bib/, and they'd no more be lost on update than any of your other
>>> "personal" files.
>
> I think on the Mac, it's <user>/Library/texmf/bibtex/bib
> (if the bibtex or bib folder does not ecist, just create it)
>
>> Would I have to add the path in the preamble then?
>
> No.

Thanks again. I will save my files there from now on.

Best*
Jess