Roughly a decade ago S3 storage pricing had a ~10x premium over self-hosted. The convenience of not having to touch any hardware is expensive.

I've run the math on this for 1PB of similar data (all pictures), and for us it was about 1.5-2 orders of magnitude cheaper over the span of 10 years (our guess for depreciation on the hardware).

Note that we were getting significantly cheaper bandwidth than S3 and similar providers, which made up over half of our savings.

Upfront costs, with networking, rack and stacked, and wired, were far under $100/TB raw, around $40-$60, but this was quite a while ago and I don't know how it looks in the era of 10+TB drives. Also remember that once you are off S3 you are in the situation of doing your own backup, and the use case dictates the required availability when things fail... we didn't need anything online, but mirrored to a second site. With erasure coding, you can get by with 1.5x copies at each site or so, with a performance hit. So properly backed up with a full double, it's about 3x raw...

Opex will be power, data center rent, and internet access are hugely hugely variable. And of course, the personnel will be at least 1 full time person who's extremely competent.

if you have looked at BB storage pods you should look at the 45drives.com the child of Protocase which manufactures the BB pods.