Ets Haim is a library and so little archive material is kept there.
The archive of the Portuguese Jewish Community (Portugees-Israëlitische Gemeente) is kept in Amsterdam's municipal archives.
If you are looking for information about your family history you can consult the "Inventory of the Archive of the Portuguese Jewish Community" (Inventaris van het Archief van de Portugees-Israëlitische Gemeente) here or you can make an appointment with the municipal archives via stadsarchief@amsterdam.nl.
Deze site is ook beschikbaar in het Nederlands