Is there a way to sync data between devices without saving on the server? : <p>I want to make my own music player website and app and I want to make it so whenever I add a new song anywhere it will update on the other platform.</p>

<p>How can I do this without actually saving all the songs on a server? I can use a server to pass the data through for syncing but I wanna do it without saving because my host limits my data.</p>

<p>Here's what I thought about but I'm not sure: Maybe every hour or so both types of clients would connect to the server and share differences (although this would be hard if I add new songs both on the website and on the app). Or I could have a manual sync button and just use it on both the phone and the app to sync. Are my ideas practical? And if not is this even possible? </p>

<p>(I can only use PHP with my host and I will use accounts i.e. username and password for the syncing)</p>
