It is expected that very few people will import the raw OpenStreetMap database snapshot files themselves, and therefore be able to load the postal address database directly from the snapshot file. As such, the Postal Address DB plugin provides means to load the postal database from a compressed CSV file, either from a file on the local computer or over the Internet from the YAAC author's website, where he posts the compressed CSV file corresponding to the latest OpenStreetMap import.
The local postal database can also be saved to a compressed CSV file on the local computer. Bear in mind this file is over 2.5GB in size as of the 12 December 2024 OpenStreetMap snapshot.