But, even that said: you can copy the binary files over to a new machine (copy-on-write snapshots -> rsync) -> store a copy -> start up the database, sanitise -> ship around to dev envs.
You’re conflating dev environments with restoring backups. Those can be the same thing but are often separate.
If you’re running hundreds of terabytes then the systems in place to shard that data must be well tested.
Migrations must happen on similarly sized data, along with various distributed transaction guarantees because I doubt you’re going to be using dedicated-attached storage for that. And if you do then testing multipath needs to be part of your testing too.
Is it expensive? Yes. But that’s what working with that amount of data costs.
Or is this a strawman intended to stump me, because I have dealt with such “data requirements” before and when they saw the sticker price of doing things properly suddenly those hundreds of terabytes weren’t as “required” anymore.