For example you have to allocate a buffer to hold the information you receive. If that's too small, you miss stuff. There is also a lot of intricacy with permissions and you can mess up a lot when multithreading without knowing how to properly interact with the OS then.
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Well there is, but it's unreliable in certain edge cases. At least not reliable enough for a backup solution.
In which case the API is broken and should be fixed.
Also, what edge cases?
For example you have to allocate a buffer to hold the information you receive. If that's too small, you miss stuff. There is also a lot of intricacy with permissions and you can mess up a lot when multithreading without knowing how to properly interact with the OS then.
Wouldn't that be worse, if anything, for the whole-drive case?