DIrectories and Files deleted on Snow Leopard upgrade from 10.5.8

We had a directory with sub folders in the /Volumes directory. When we upgraded snowleopard the directory and files were deleted. Why no warning and why were they deleted? I understand that the /Volumes directory is used as a mount point for external drives etc...,  but why would the upgrade delete files in that directory or better yet why would it allow you to even create an actual directory with files below it if you were not supposed to store files there.  It was a loss  of 40GB or 3.5 years of data. We also found that Time Machine or Carbon Copy do not back up that directory as well.
Is this a bug related to the permission changes involving UID, GID 200 or what? Why don't backup utilities pick up the files in the /Volumes dir?

What I do not understand is why a regular directory with files stored in it  under the  /Volumes directory would be deleted when upgraded.
I realize that you don't understand it. I don't know how I can explain any more clearly than I already have, that it's a reserved directory. If you have anything in that directory other than the automatically-created mountpoint for a local volume or a remote AFP volume, then your system is in an inconsistent state. A potential mountpoint exists, but it's not in use. That should never happen. The Disk Arbitration framework must always be free to create or remove a mountpoint in /Volumes with any name required. Otherwise it won't be able to function as the user expects.
If a system installation does anything at all, it must leave the system in a consistent state, which means that it must delete the extraneous files from /Volumes. I repeat that I'm sorry you experienced a loss of data due to this misunderstanding. Arguably the Installer should have moved the files to a safe location instead of deleting them, but to be honest, I doubt that it occurred to anyone at Apple that something like this might happen. They took precautions to keep users from tampering with the /Volumes directory.

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