Don't worry, your data and information is safe!
During activation, you are guided through recovery set up to allow you to restore your PassKey Lite without loss of data or information. If you did not do this during activation, you can do recovery set up at anytime using the Recovery Set Up option.
Restoring your PassKey Lite is as simple as installing the app on your new phone and running the Recovery option. Instructions are available here.
Yes, you can install PassKey Lite on multiple devices, however, each device is a unique key and should be associated with a separate email account. The devices cannot be used interchangeably.