Anyone else building a personal knowledge base from web content? What's your workflow?

I've been going down this rabbit hole of building my own personal knowledge base, and I'm curious if anyone else is doing something similar.

My goal is to create this comprehensive digital library of everything I find interesting or useful online - articles, tutorials, research papers, blog posts, you name it. I'm talking about actually preserving the content, not just bookmarking links that might go dead in a few years.

Right now I'm using a combination of tools:

• Obsidian for organizing and connecting ideas
• Notion for structured data and project management
• Local folders for archived content
• Tags and cross-references to make everything searchable

But here's where I'm struggling: actually capturing web content reliably.

I've tried the usual suspects - browser bookmarks (useless when sites go down), copy-pasting (loses formatting and images), screenshot tools (not searchable), and even tried some read-later apps but they're more focused on temporary storage.

The dream would be to save complete webpages with all their formatting, images, and styling intact, then organize them into my knowledge system. Like having a personal internet archive of everything that matters to me.

What's your setup? Are you building something similar? How do you capture and organize web content for long-term reference?

I feel like there's this whole community of people trying to build these "second brains" but we're all reinventing the wheel separately. Would love to hear what's working for you!