We know that a Nintendo Switch will finally get cloud saves (the usually process of save government a complement will have) with a arriving Nintendo Switch Online service, though worryingly enough, we don’t indeed have adequate information on how it will work. And with Nintendo’s matter that it will work with “some games”, people have been fresh for a worst, and awaiting sketchy doing of a feature.
However, it doesn’t seem like that will be a case—it seems like a Switch will automatically supplement cloud saving support to all existent games, and that a developer will have to actively opt out of that, according to a news by Nintendo Life. Apparently, that will also request to arriving Switch games—developers have to actively opt out of cloud save support, and they need to clear their doing so with a correct reason as well.
So on a whole, it sounds like unless your diversion could be compromised by save backups (so something like Animal Crossing or Pokemon), it should support backups on Switch only fine.
The Nintendo Switch Online use is due to launch after this month.