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Not all games back up to the cloud and you nees an active NSO subscription to be able to backup to their cloud.
I haven’t seen this video yet (battery almost dead, gonna watch later) but this device appears to let you backup your saves locally without running it by Nintendo.Edit: I forgot that Switch cartridges don’t hold saves so this device can’t do that.
No, the device is purely to dump game cartridges. It has nothing to do with your saves (which are stored on your Switch).
To dump your savegames, you need access to your Switch’s internal USER partition.