On a SimDif Pro site you can download a backup of your site by following these steps:
1. Go to the Site Settings (yellow button, top right).
2. Find “Download this site”.
3. Select the “Download” button.
4. Choose where to save the zip file.
This feature does not work on iOS as Apple does not allow you to save a file directly on your device. You can backup your site from an Android device or with any computer.