Windows Server 2008 and 7 have an automatic defrag task that runs weekly.

Since this rearranges blocks around on the disk, this can cause image-based backups to be much larger than is necessary.

We recommend disabling the task for production environments:

1. Click Start, then open control panel:
   
2. Under control panel, open “Administrative Tools”
3. Then open “Task Scheduler”
4. In the Task scheduler, expand out the scheduled tasks under “Task scheduler library”->”Microsoft”->”Windows”->”Defrag”
5. Right click on the “ScheduledDefrag” task and choose “Disable”
   
6. This will prevent Windows from automatically running the defrag task and needlessly increasing the size of the backup incrementals