I have some features planned related to this. I recognize why it can be useful to extract one or more songs to a .msf file from a backup, and I may support setlists for this (but the current backup extraction feature in the companion app does not list setlists, just songs). You can use the companion app to extract individual PDFs from a backup file - so you can already do that if that's all you need. I don't know the timeline for this though, as I have a lot of other things I have to work through first.
Mike
Mike