Tape, if it fits your storage needs. You won't beat the cost of tape if you are doing cold storage. For online or nearline storage, you should look at what Ba

Tape, if it fits your storage needs. You won't beat the cost of tape if you are doing cold storage. For online or nearline storage, you should look at what Backblaze did. Either buy hardware that is similar to what they did (basically disk shelves, you can cram ~100 drives into a 4U chassis) or if you are at that scale you can probably build your own just like they did.