S3 is too expensive to do a restore from. And you have to restore to verify.
An LTO drive is easily $10.000. You can restore a lot of S3 data for that amount of money. Sadly getting cheaper tape options is not really possible anymore.
Ah that sucks :(
Rule #25: Try to avoid making what one may purchase, as the total cost is often many times higher than first assumed.
It is tempting for many, but often doesn't end well for businesses. =3
I used to use Backblaze B2, which had cheaper egress at the cost of slightly more expensive storage (I think ~$5/TB/mo, with free egress up to 3x all current storage?) So I paid $20. But at some point AWS opened a datacenter near me, and I couldn't ignore how much faster data transfers got.
The point is the cost doesn't scale well.