Yes you can do this but I don’t recommend it unless you’re very careful to manually maintain a method to track compatibility. You need to understand that individual backups of these items can’t just be reloaded independently at a later date and expect things to work together properly. By ‘things’ I mean the tightly integrated set of data that exists on the Stadium device. Among other things it contains User Presets, Setlists (aliases of Presets), and Showcase Songs (containing Flags that can reference Presets). If you simply load a backed up copy of your User Presets you can easily break any references to existing Presets contained in your Setlists or Songs.
With OG Helix you only had to keep Presets and IRs compatible manually. With Stadium there are more individual items that you can export/import individually yet are interdependent: User Presets, Setlists, Songs, IRs, and Clones. These (at least) compromise a tightly integrated dataset.