...Another thing I was considering is just getting a NAS, because the thing I'm interested in is largely to keep data synced across multiple devices, and have it not go away when I get rid of devices. I was looking at QNAP, but unfortunately their only fanless case only allows 2 drives, and their syncing tool only works for mac+win (https://www.qnap.com/i/en/product/model.php?II=147&event=5).