Data sets in the Bus Open Data Service contain a link to the data itself which is typically hosted by bus operators themselves. This link can be used to retrieve the latest version of the data.
The Bus Open Data Service also caches data so that you can download a copy directly from this service. This cached version is refreshed every 12 hours. The cached version can be used should the live hosted version be unavailable.
The links to the hosted and cached versions of the data can be accessed from the data set pages in the web interface and through an API.