This is, a TV-station would continuously broadcast the latest Teletext-magazine for Teletext-clients to cache. Then users could view articles from their local cache.
Reference: https://en.wikipedia.org/wiki/Teletext
EDIT: Apparently most implementations wouldn't cache something until the user requested it, then the user would wait until the next send.
Most pages had multiple "sub-pages" - so the BBC TV listing would start in the morning, as 1/5 - then on each refresh, it would show 2/5, 3/5 etc. If you really wanted to study a particular page before it would reload, there was often a "Hold" button that paused the refreshes. Then, when you "un-held" it would jump to whichever page was sent on the next update.
Watching the scores on a Saturday afternoon, updating across the various leagues, was a ritual for every football fan. (Maybe page 302 for football scores?)
Bamboozle was page 451 on Channel 4 - everyone loved that.
There was no stored data.