Hi jgeorges,
You can set up BMR protection for a computer by using the Create New Protection Group Wizard. You can select BMR protection from under the System Protection node on the Select Group Members page of the wizard.
DPM does not have any space requirements on the protected computer for BMR protection. WSB directly transfers the backups to the DPM server. DPM reserves 30 GB of space on the replica volume for BMR. You can change this by using the Disk Allocation page
in the Modify Protection Group Wizard.
Size of BMR backup can be roughly calculated sum of used space on all critical volumes.
Critical volumes = Boot Volume + System Volume + Volume hosting system state data
To see which volumes are included in the BMR backup, run this command from an administrative command prompt: wbadmin.exe start backup -allcritical -quiet -backuptarget:%1
The %1 will cause it to fail if you proceed by answering Y, but will show what volumes are included in the backup.
technet link: http://technet.microsoft.com/fr-fr/library/ff634208
other usefull link:
http://social.technet.microsoft.com/Forums/en/dpmssandbmrbackup/thread/c6d4da4d-3417-4bfe-b81d-fa93cf2147ef
Stephane.
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