@strypey @zicklag @benpate @activitypods @erlend As far as I know, the "backup to PDS" thing is seen as "something we could do in principle, but haven't implemented yet".
As I understand it, Solid uses a strictly "RDF / JSON-LD" approach, and I doubt that Roomy's current data model would fit into this very well.
(I'm not directly involved in Roomy development, but I've been hanging out in their internal chats, and following their evolution really quite closely.)