I back up around 20TB and the easiest solution I found was to just buy 4x12TB drives and mirror to cloud (yielding 2x offline copies). For stuff that's really

I back up around 20TB and the easiest solution I found was to just buy 4x12TB drives and mirror to cloud (yielding 2x offline copies). For stuff that's really really important, around half of that, and which if restore is needed fast access is required, I also back it up to SSD. It's not the greatest solution, but when you're hovering at some small multiple of common single drives, it's certainly the easy answer.