@grannyring : how are you streaming from the PULSar? Assuming via Sense? (not Roon or similar). From the website https://innuos.com/pulse-series/
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– In Standalone mode, you are able to use the Innuos Sense app to play streaming services, Internet Radio and music stored on a NAS to a multitude of audio systems. In this mode, the network player becomes the centre of your audio system, enabling also to use the Sense app with other streamers on your network.
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The other option (Endpoint mode) would require a ZEN series server, which appears you no longer have. So I am afraid a NAS will be needed. But then in your OP you say:
My music, only 1100 CDs, is already stored on a Raid and I will only use this Raid for backup.
What do you mean by “Raid”? It can mean different things. Maybe you already have a NAS? A NAS is simply a storage device connected to the network that can be accessed remotely in that same network from other devices