I just use the built-in RSS feed downloaders in utorrent or qbittorrent and they work fine for me.
For years now, I've been using an old windows laptop as a torrent box for pretty decent power savings and ease of use. I'm just waiting for Seagate to release its new 2.5" 5TB drive locally so I can also also use the laptop as a full fledged and upnp/dlna media server.
I've considered setting up a dedicated NAS but the associated cost always put me off.