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You're going to want a NAS. Most consumer systems can only wire up four ssds/nvme ssds. If you want 6 TB of capacity and you want redundancy. That means that minimum raid one and 12 TB of capacity. https://en.wikipedia.org/wiki/Standard_RAID_levels
3 x 3TB drives in RAID 5 will get you (almost) 6TB with only 9 TB total capacity, and its more fault tolerant than RAID 1. Also, its cheaper to replace a single 3TB drive than a single 6TB drive, so it'll spread your costs out more.
I have 4 x 3TB drives on RAID 5, and I got three of them used for cheap at a local computer place. They'll have lower life expectancy, but unless more than one dies at a time, it'll be cheaper to replace them as they do. I got 1 drive new, and plan to replace 1 drive every year or two with new.
Unless you need speed, definitely consider HDDs, especially NAS grade. They're slower read/write, but your use case shouldn't need a lot of have read/write. HDDs--even the premium ones--are way cheaper than SSDs right now with the shortage, and have great longevity.
3 x 3tb in raid5 can lose one disk of three. That is less redundancy than raid 1 on 2 disks, plus a write penalty.