If you have good sysadmin/devops types, this is a few racks of storage in a datacenter. Ceph is pretty good at managing something this size, and offers an S3 interface to the data (with a few quirks). We were mostly storing massive keys that were many gigabytes, so if you have smaller keys, so I'm not sure about performance/scalding limits with smaller keys and 10PB. I'd be sure to give your team a few months to build a test cluster then build and scale the full size cluster. And a few months to transfer the data...
But you'll need to balance the cost of finding people with that level of knowledge and adaptability with the cost of bundled storage packages. We were running super lean, got great deals on bandwidth, power, and has low performance requirements. When we ran the numbers for all in costs, it was less than we thought we could get from any other vendor. And if you commit to buying the severs racks it will take to fit 10PB, you can probably get somebody like Quanta to talk to you.
But you'll need to balance the cost of finding people with that level of knowledge and adaptability with the cost of bundled storage packages. We were running super lean, got great deals on bandwidth, power, and has low performance requirements. When we ran the numbers for all in costs, it was less than we thought we could get from any other vendor. And if you commit to buying the severs racks it will take to fit 10PB, you can probably get somebody like Quanta to talk to you.