Ideally one that can use more than one disk so that i can expand it later when i can. Have some minimal experience with Synology since there’s one at work and i have interacted with it a couple times and like the interface, but am not married to any brand as long as it works.
Located in EU if it makes any difference.
Buy the cheapest old computer on your equivalent of Craigslist and install TrueNAS. If you want to use a lot of drives, make sure there are enough SATA connenctions on the motherboard.