If i remember correctly HDDs have a lifespan of about 50 years, while SSDs only 10. So I'd suggest you to buy an HDD
Hardware
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If you all you care about is TB/$ you still cannot beat tape as long as you are using enough tapes.
It really depends how much you are talking about
I also have dvds that I use as storage sometimes. There are also m.2 nvme ssds and even USB drives that you can find for cheap. I still have many memory storage that I've had for a while. I'm not exactly sure if you are planning on having this storage always accessible, but I don't see an issue with DVDs. You can still fit a lot on 4 GB DVD and if you need something bigger there are a lot of cheap SanDisk generic USB drives you can get at like a Walmart.