I use my old DS214play with HDDs as a destination for local backups. One of the SSDs in the newer NAS hosts files for a music server (Roon Server, to be exact). With the HDDs, it got so laggy that the software wouldn't even properly index newly added files. With the SSDs, by the time I've copied files to the watched directory, Roon has already indexed them by the time I click over to the player window. It's not like the audio files are high bandwidth (compared to, say, 4K video), but still, I've never had a single dropout since moving to SSDs.