The Switch 2 Editions of both Zelda games won't support cloud saves for data backup, and it's currently unclear why.
On the store pages for both Zelda: Breath of the Wild and Zelda: Tears of the Kingdom on Switch 2, a disclaimer reads: "Please note: this software does not support the Nintendo Switch Online paid membership's Save Data Cloud backup feature."
This same disclaimer is not present for other Switch 2 Edition games - Super Mario Party Jamboree, Metroid Prime 4, or Kirby and the Forgotten Land - so it's unclear why this is only impacting Zelda games.
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Gaming