My cat's vet had a drive crash with no backup, and they lost all kinds of billing data and customer data, so they went through a data recovery service.
They did run somewhere around $900, and did recover data, but it was a big mess, and they ended up entering it all back in manually because they found it too much of a problem to work with whatever the data recovery service gave them back.
They are now running backups per some suggestions I gave them from my days as a DBA.
That is the only set of folks I am aware of that have gone through that exercise, so I cannot tell you it would be representative of the services in general, one way or the other.
Bob Bone