Backup VHD size is much more than expected and other backup related questions.

Hello,I have few windows 2008 server and i have scheduled the weekly backup (Windows Backup) which runs on saturday.
I recently noticed that the actual size of the data drive is only 30 GB but the weekly backup creates a VHD of 65 GB.This is not happening for all servers but for most of the server.Why is it so..and how can i get the correct VHD size..60 GB VHD does't make
sence for 30 GB data.
2. If any moment of time if i have to restore entire Active Directory on windows 2008 R2 then is is the process same as windows 2003..means going to DSRM mode,restoring the backup,authoritative restore or is there any difference..
3. I also noticed that if i have a backup VHD of one server (Lets Say A) and if i copy that Backup to other server (Let Say B) then windows 2008 only gives me an option to attach the VHD to server B but through backup utlity is there any way to restore the
data from the VHD,Currently i am doing copy paste from VHD to server B data drive but that is not the correct way of doing it..Is it a limitation of windows 2008?
Senior System Engineer.

Hi,
If there are large number of files getting deleted on the data drive, the backup image can have large holes. You can compact the vhd image by using diskpart command to the correct VHD size.
For more detaile information, please refer to the thread below:
My Exchange backup is bigger than the used space on the Exchange drive.
https://social.technet.microsoft.com/Forums/windowsserver/en-US/3ccdcb6c-e26a-4577-ad4b-f31f9cef5dd7/my-exchange-backup-is-bigger-than-the-used-space-on-the-exchange-drive?forum=windowsbackup
For the second question, the answer is yes. If you want to restore entire Active Directory on windows 2008 R2, you need to start the domain controller in Directory Services Restore Mode to perform a nonauthoritative restore from backup.
Performing Nonauthoritative Restore of Active Directory Domain Services
http://technet.microsoft.com/en-us/library/cc816627(v=ws.10).aspx
If you want to restore a backup to server B which is created on server A, you need to copy the WindowsImageBackup folder to server B.
For more detailed information, please see:
Restore After Copying the WindowsImageBackup Folder
http://standalonelabs.wordpress.com/2011/05/30/restore-after-copying-the-windowsimagebackup-folder/
Best Regards,
Mandy
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