Question about Flycast per game VMU option

I’ve been using FLycast for a while now, and it has always been configured with the “Per game VMU” feature disabled. The thing is, my VMUS are starting to lack space, so I would like to use the per game VMU feature. What will happen then with my current saves? Will I lose everything? Am I going to be able to transfer all my saves to the new set up?