I know it's not a feed aggregator, but you could intrumentalize pinboard (pinboard.in), they have the option of retrieving and storing an archive of all your li

I know it's not a feed aggregator, but you could intrumentalize pinboard (pinboard.in), they have the option of retrieving and storing an archive of all your links if you so desire. They even resolve first level dependencies, so external images are also stored (see https://blog.pinboard.in/2010/11/bookmark_archives_that_don_t/ https://blog.pinboard.in/2010/11/bookmark_archives_that_don_...). See some numbers on link rot here: https://blog.pinboard.in/2011/05/remembrance_of_links_past/ https://blog.pinboard.in/2011/05/remembrance_of_links_past/ Pinboard is built as a bookmark manager, but if you say that all entries in a feed is a bookmark then it should work for you. Oh and there's full-text search as well.