The size of a computer-backed system for a local Spotify-like app would depend on several factors, including the anticipated user base, the amount of data that needs to be stored, and the desired level of performance. For a smaller user base with less data, a simple server setup with a single database server may be sufficient. However, as the user base grows and more data is added, a more complex setup may be necessary to ensure that the system can handle the load. This could include multiple servers for load balancing and redundancy, as well as distributed databases to handle the increased data volume. In addition, performance considerations would play a key role in determining the size of the computer-backed system. The system should be able to handle a large number of simultaneous users without slowing down or crashing. This would require careful consideration of factors such as server capacity, network bandwidth, and database optimization. Overall, the size of the computer-backed system for a local Spotify-like app would need to be tailored to the specific needs of the product and the anticipated user base. As a product manager, it would be important to work closely with the development team to ensure that the system is designed and implemented to meet these needs effectively.