Once Save Data Backups are deleted from the server, they cannot be downloaded to a Nintendo Switch console.
Save data backups can be deleted from the game's software menu or from within System Settings.
Deleting a save data backup will not impact the existing save data on the console.
Complete These Steps:
To delete a backup from the software menu:
Open the game's software menu by highlighting the game on the Home Menu and pressing the “+” or “-“ Button on the Joy-Con.
Select "Save Data Cloud Backup."
Select the desired user, then select "Delete Backup Save Data" twice.
To download a backup from within System Settings:
From the HOME Menu, select "System Settings" > "Data Management" > "Save Data Cloud Backup."
Select the desired user, then choose the backup file you wish to delete.
Select “Delete Backup Save Data” twice.