I'm not familiar with DVM Manager, but if it's a program that you can copy, then likely it's a DOS based program that doesn't present the difficulties that Windows based programs have. If that's the case, the data should be contained in the copy (for example, VHM for Windows contains everything (nearly) in the VHMWin subdirectory of the root drive. But it will not work by just copying it over - it won't link to essential Windows files.
There may be some issues with the setup tho', so I'd experiment with it before actually starting to work with it. Have one of the folks (who usually enters data) work with it for a couple of hours. Alternatively, a call to the tech support for the problem will usually get you some more straightforward answers (I've gotten to know the VHMWin folks pretty well myself!) In short, don't erase anything, or even try moving from the old system to the new one without being sure you've got everything (data entry to reconstruct records is a nasty chore that no one likes!).
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