"So, there is a copy available."
But us it legally admissible if required? Probably not, since it's a copy and may have been tampered with and can no longer be compared to the original. The chain of evidence is broken. And anyway, this is only incidentally about Trump. Primarily it's about an ancient server with ancient software and whether it was up to the job, not to mention the loss of data with the legal requirement it be retained.