I'm looking for a simple and user-friendly app that allows each family member to back up their phone photos over a local network and view them on their devices. User permission controls would be ideal. It's also a plus if the app can be cast to a TV. The app should have minimal ads and be easy to navigate. I'd also like the app to support expandable storage, whether that's a mechanical or solid-state drive. Photos can likely be stored on a mechanical drive. Performance, capacity, and affordability are also important, with a budget of around 800 yuan. I'm considering recommending a specific brand, but I'm also open to DIY solutions. However, I'm not sure if DIY options would require installing an operating system and if they would come with a user-friendly app.