If you own a physical or digital copy of the game, you may be legally allowed to create and use a backup NSP under certain jurisdictions (varies by country).
When Tears of the Kingdom leaked two weeks before its official release, the file spreading across the internet was an NSP. This caused a massive controversy in the gaming world. Here is why the NSP format was specifically chosen for the leak: legend of zelda tears of the kingdom nsp
The Legend of Zelda™: Tears of the Kingdom for Nintendo Switch If you own a physical or digital copy
: Allows Link to pass upward through solid surfaces, drastically reducing the need for tedious climbing. legend of zelda tears of the kingdom nsp