It is possible to export your list of cameras. Simply go into Settings, find CamViewer and enable "Save Cameras List". The app will then export your cameras to a file called CamerasList.plist in the app's documents folder. You can then copy this off your device using iTunes.
This can be useful for backing up the list if you need to delete the app or to transfer the list between versions of the app.
To import, simply drag this file back onto the app's documents folder in iTunes. It must have the name CamerasList.plist. The app will not create duplicate entries so it should be ok if you accidentally do this twice. If the app was running when you copied the file over you may need to kill it.
On iOS7 and above:
On iOS6 and below: