I also organize my fcpx work and projects with .sparsebundles, stockfootage.sparsbundel, projectA.sparsbundle privat.sparsbundle.
For the moment I have scripts thats mounts, the client.sparsebundle and the server.sparsebundle.
Then I do incremental backup of then content.
How do you backup yours sparsebundles?
Does inkremental backup work?
How does Time Machine backup a sparsebundle?