How To Import Game Save Data On Nintendo Switch 2
Briefly

When setting up the Nintendo Switch 2, saving data from the original console can be seamlessly transferred during the initial system setup by transferring user data. This transfer ensures that all saved games are automatically imported. However, if this process is skipped or the original Switch isn't available, users can still access their save data via Nintendo Switch Online cloud saves, provided they have an active subscription and internet access.
If you transfer your user data from the original Switch during the initial Switch 2 system transfer process, it imports your saves automatically.
Account-based cloud saves are your only other transfer option after the initial system setup. If you skip the system transfer process...your save data after that is by using Switch Online's cloud saves.
Read at GameSpot
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