Go to %appdata% within your windows files then \LocalLow\Siactro\SuperKiwi64 And backup all the files.

You can either go to your Windows File Explorer and enter this (remember to change the username to your own: C:\Users\YourUserName\AppData\LocalLow\Siactro

Or you can go to your Windows Start Button and enter %appdata% in the search bar.

Note:
if you can't see the folder, you need to go to your Windows File Explorer and then to View Button which should roughly be in the top centre of the bar.

Then go to the bottom of the list and hover over Show, then go to the bottom one and click Hidden Item, now you should be able to see all hidden folders.

Now click on LocalLow as shown in the picture.

Next click on Siactro.

Now you are in the folder with all your Siactro Game Saves, now you can either copy all your Game folders and make backups of them all or the individual folders, depending on if you have 1 or more
in that case save the Kiwi or one of your Ducks if it applies.