There doesn’t seem to be a way to easily catch up to a feed which has been going on for years.
I found this feature implemented on a comic-following RSS site:
https://www.comic-rocket.com/help/archive-binge/
(They have a way to subscribe to an old feed and go through it retroactively)
Having this to follow sites in general would be amazingly useful.
There are lots of sites were really active for a few years, but have now trailed off because everything’s covered already. This feature would make them usable again. There are a couple ways it could be done:
- the hard way - subscribe to a feed and every day, newsblur would just add a couple more entries, in time order, from the founding, until you were caught up with live.
- the easy way - just be able to subscribe to a feed and mark all unread, and have articles shown in time order, marking them done as you go.
- the really hard way - subscribe to a feed, offset by a certain timespan. So you could subscribe to a blog “as if it was 10 years ago” and pace it through time (articles would show up 10 years late in your feed, exactly). This would be awesome but maybe overkill.