I've got the following setup:

* a virtual machine with a virtual HDD at 160GB split over around 50 files (it's a VMWare VM, so I'm talking about VMDK files)
* after working in the VM for some hours, my daily backup will copy all 50 file, because they all have modifications

My question is this:

* Is there a tool to "defragment" the windows file system in a way to keep the busy files roughly together?
* (The idea is that fewer HDD files are modified in order to improve backup performance)

My questions are **not**:

* How to defragment a HDD in general...
* How to improve backup performance in general...
* I'm not looking for suggestions on backup software...