Uploading saves to the cloud requires a subscription to Nintendo Switch’s paid online service. By utilizing the Nintendo Switch’s online service, save files will be automatically uploaded to the cloud, allowing for progress to be backed up and also transferred onto other devices. In a recent interview with GameSpot, Blizzard Entertainment employees explained how this works:
“Switch automatically uploads save files. The only thing that won’t upload is leaderboards, but anything else such as achievements or progress that’s made through campaign will be [uploaded],” explais Diablo III associate producer Matt Cederquist.
“Another cool feature is the ability to play offline and still have progress count, and you can load your profiles back and forth, so if you’re on a buddy’s Switch you can load your file and get the character you want in the game too,” added Diablo III senior producer Pete Stilwell. “I think this [is] the next evolution. The portability of Switch [and] the ability to play offline with your friends locally between multiple Switch [consoles] is really powerful. We’re excited to be able to travel, [play] this on a plane, get off the plane, [and] upload progress.”