Not quite the correct application but linkwarden would work. Stores all your links but also backs everything up via html, plain text, and pdf. You can categorize content and tag content. Then there are filter and search tools.

You can just give it PDFs and it will import them over as well. Only saves them as a pdf but still would work.

I’m guessing this is not the best approach but wanted to give you options.

The only reddit community I’ve yet to find a home for on Lemmy is /r/fountainpens. I don’t post there though. As a lefty getting into underwriting and fountain pens was really good for my penmanship. This in turn was good for my journaling and mental health. I don’t feel bad about it.

IRRC there was a Lemmy channel for it but it was really small.