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Recommended method to bkup DPM volumes before deleting replication data? RRS feed

  • Question

  • This question is related to an earlier post about how to resize replica volumes, see http://social.technet.microsoft.com/Forums/en-US/dataprotectionmanager/thread/ed0c5111-4b73-4cde-bf0a-0b51316b32ed.

    I'm wanting to backup the Replic and Differential backup data from the corresponding DPM volume prior to deleting it.  Permissions on the Replicas and DiffAreas folders in \Microsoft DPM\DPM\Volumes prevent domain admins even from backing up files directly by using Copy & Paste.  What is the proper method of ensuring I get all the data from these folders backed up to an external USB drive?  Can NTBackup get all the data correctly, if logging in as local administrator?  (It's currently running anyway.)  Thanks.

    Using DPM2007 on Server 2003 SP2.  Backing up Exch Srvr 2007 storage groups, WSS 3 sites, and a number of drives on other servers.  Single domain.

    Monday, September 20, 2010 4:23 PM

Answers

  • Hi,

    The replica and recovery point volumes cannot be backed up in such a way that you can recover files from earlier points in time after copying them.  The VSS Infrastructure works in mysterious ways to maintain shadow copy integrity, about the only possible chance of doing that operation would be to use block level disk mirroring. However, recovering from shadow copies after moving the disks to a new server would be painful provided we maintained the shadow copies properly.

    One way to do this would be to move the mirrored disks to a Windows 2008 server, import them, then use diskshadow.exe to list all snapshots, expose a snapshot to a drive letter, copy the data out, then unexpose the snapshot and repeat until all shadow copies data are copied out.  Of course, these will be full backups each time, so you will need much more storage.

    The only other way to do that would be to go into the recovery tab on the DPM server, select a datasource, select a previous point in time from the calendar and restore to alternate location, that being your USB drive, or to tape if you have one connected to the server.  Again, you need more storage to hold all the full backups being exposed.


    Regards, Mike J [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
    • Marked as answer by Romseye Monday, September 20, 2010 7:29 PM
    Monday, September 20, 2010 5:44 PM
    Moderator

All replies

  • Hi,

    The replica and recovery point volumes cannot be backed up in such a way that you can recover files from earlier points in time after copying them.  The VSS Infrastructure works in mysterious ways to maintain shadow copy integrity, about the only possible chance of doing that operation would be to use block level disk mirroring. However, recovering from shadow copies after moving the disks to a new server would be painful provided we maintained the shadow copies properly.

    One way to do this would be to move the mirrored disks to a Windows 2008 server, import them, then use diskshadow.exe to list all snapshots, expose a snapshot to a drive letter, copy the data out, then unexpose the snapshot and repeat until all shadow copies data are copied out.  Of course, these will be full backups each time, so you will need much more storage.

    The only other way to do that would be to go into the recovery tab on the DPM server, select a datasource, select a previous point in time from the calendar and restore to alternate location, that being your USB drive, or to tape if you have one connected to the server.  Again, you need more storage to hold all the full backups being exposed.


    Regards, Mike J [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.
    • Marked as answer by Romseye Monday, September 20, 2010 7:29 PM
    Monday, September 20, 2010 5:44 PM
    Moderator
  • Thanks again for your help.
    Monday, September 20, 2010 7:32 PM