Wii Backup Manager is a free and portable software that makes it possible to transfer games from the Wii console to external storage devices such as USB sticks and hard drives. Thus allowing the execution of these games directly from these devices connected to the console.
How to run the software
After unzipping the file, run the file according to your processor architecture, WiiBackupManager_Win32.exe in case of 32-bit and WiiBackupManager_Win64.exe in case of 64-bit.
How to transfer a game
Go to the Drive 1 tab and select the desired storage device;
Select the game in the Files tab;
Still in the Files tab, go to Transfer and select Drive 1;
Now just wait, as it may take some time depending on your computer.