Android : android opencv sync trained images to server

I'm new to android programming and I'm developing a project wherein the application can be used in multiple android devices.

The process is that in first device, faces will be trained. And i want those faces that are saved in device 1 to be also present in device 2,3,4 and so on.

So the question is how can I copy the trained faces in one device to other devices?

I think i don't need to post such codes because for now I only want to know maybe the process needed or the logic. Thanks in advanced! :)

Note: Faces are trained with the use of LBPH algorithm.