It might sound silly but what has worked for me for years is basically just having 3 boxes/folders. "todo", "done", "important". The first containing the docs I

It might sound silly but what has worked for me for years is basically just having 3 boxes/folders. "todo", "done", "important". The first containing the docs I still have to act upon, second for things that I don't need long term, but can be useful to keep around for a while (bills, etc.) and the last one for things I do want/need to keep (contracts, work visa, etc.). Everything is kept in chronological order. It isn't very fast to look up things up, but given I hardly ever have to access those docs I think I save more time not having to think about how to classify documents than the search once or twice per year for a doc.