One thing that is designed to be future-proof is MarkDown, I’ve been taking profesional and personal notes and exporting important information from web pages to markdown and hosting it on my own PC for a while.

MarkDown it’s text based so you can have a huge amount of data with just a tiny bit of space. And it is easily translated/rendered as HTML. Apps like Logseq, Obsidian or Markor are good starts for managing huge vaults of information.

I’m thinking that whe should create a MarkDown community here.

edit: There’s one already! https://lemmy.ml/c/pkb