The only legally bulletproof way to handle NSP files is to "dump" them yourself. If you legally buy a digital game from the eShop, you can use a modified Switch console to extract your personal purchase into an NSP file for emulation or offline backup storage.
The Legend of Zelda: Breath of the Wild remains a landmark achievement, offering an unparalleled sense of wonder and agency. The Legend of Zelda Breath of the Wild -NSP- -J...