The My Demo animated preview is stored in the AnimationPath.txt file in the folder //[User]. This location may not be visible on your Mac®, but you can find it using the following steps.
Open the Finder window.
Open the Go menu.
Hold down the Option (Alt) key, and choose Library.
Browse to /ApplicationSupport/mySewnet/Embroidery1/System.
Copy the file AnimationPath.txt to your backup location.