The Switch has one particular feature that doesn't get enough talk: basically any game update can be sent to another Switch peer-to-peer. I'm pretty sure it even works with Game Key Cards, since they're just a rebrand of an annoyance that the Switch 1 had since launch.

You could, at least hypothetically, put every physical cartridge in a Switch or Switch 2 and download all the updates to those games, and just have an offline mirror of Nintendo's entire update CDN. More likely someone should make a homebrew app that archives update data by using this weird peer-to-peer update protocol, but I have no idea what encryption would need to be broken to make that work. But it would be a legitimate boon to game preservation to have something where someone with a bone-stock Switch and a game can just download the update they need and be done with it.