I scan everything pretty aggressively, since I hate physical papers of any kind lying around. Documents that are scanned within the last ~month sit unencrypted on a NAS, and organized in the style of "/2021/Taxes", "/2021/Bills", etc.

Periodically I take the current batch of unencrypted files and add them to a VeraCrypt volume, which contains files organized in this way, going back to around 2005. The encrypted volume sits on the same NAS. There have been surprisingly few times that I've had to "search" for an old document in the archives. And when I do, I can just go to the target year folder, and glance through the scanned images, and also make sure to give descriptive names to the scanned files, if it's important.

Once every few months I back up the encrypted volume to a gold-layered DVD disc (The encrypted volume is still nowhere near 4.7 GB), and store it in a cool, dark place.