noob questions seeking non-noob answers - Lemmy.World

I’ve been interested in self hosting a small variety of services yet I’m so confused on where to start. What would you guys recommend for a server machine? My main uses (and some of the services I think are appropriate for the use case) are: - 1tb photo, video storage, push/pull (immich) - 512gb total shared between downloaded music storage (navidrome) and pdf/ebook storage (calibre)—all pull only - 1tb movies/tv storage on a media server (jellyfin) - 512gb storage for random junk or whatever, plus a file transfer push/pull (syncthing…? or nextcloud?) - potential basic bio website hosting (near future) - potential email hosting (distant future) anyways with that all said i have a few questions: - what server should i buy if i want to expand storage in the future? should i just build a pc with like 3x1tb storage, or 6x1tb storage w/ redundancy? totally confused about the concept of redundancy lol - any thoughts on the services im suggesting? especially for file transfer