Personally, I settled with colocation. I pay $60/mo + $2k one-off for the initial hardware + say $150/5y/4TB HDD, which, for 80TB of storage over 5y comes out to a total of ~$88/mo, or $0.001/GBmo. Even if I was to store 3 copies of everything instead of doing erasure coding, my costs are roughly half of what Backblaze B2 charges. And my disks are fully online block storage, not necessarily object storage.