All of your work is automatically saved to the Yuzu cloud by the Auto Sync function.
Web App - As you turn pages any changes you have made are automatically saved to the Yuzu Cloud.
Offline Apps (iPad and Android) store your changes on your device when you are reading offline. The Yuzu App will automatically save your changes to the Yuzu Cloud the next time you are reading while your device has a live internet connection.
If you switch to a new device:
Offline Apps (iPad and Android): when you download the content to the new device the latest saved changes will appear in the content.
Web App: The latest saved changes will always appear when you access your content from any device.
NOTE: If you use the Web App to access your account, you can lose any highlights or notes created offline using one of the Offline Apps that has not had a chance to save to the Yuzu Cloud.