We have a deduplicated volume on a Windows Server 2012 machine that is approaching it's limits. It is a 1.3TB drive with ~10TB of duplicated data. We want to copy all of this data onto a larger 4TB drive.

What is the best way to perform this copy such that we only copy the 1.3TB of deduplicated data instead of unpacking the entire 10TB and repacking it on the other end?

edit: I attempted a standard explorer file copy and a Copy-Item but neither appeared to be dedup-aware. I didn't run either to completion however so I can't say this is the case for sure.