Pretty geeky but I use HPI, confusing to set up but once you do it will periodically backup reddit saves, tweets/likes, Roam, FB messenger, telegram, Pocket, etc and let you search across it all with some simple python. @karlicoss made a killer tool www.github.com/karlicoss/HPI
Also have my own custom app, similar to Readwise, that backups up Annotations and highlights from my android ebook app (App/Moon+ Reader), Calibre, goodreads, kindle, google play books, notion. Very elaborate and hacked together but it's worked smoothly for a while now
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