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Virtual Machines Backups (Full and Incremental - Every 1 week with 4 weeks of Retention) RRS feed

  • Question

  • Hi,

    How DPM (2012 SP1 or R2) works when I have the following scenario, backing virtual machines up:

    - Backup Weekly

    - Retention period: 4 Weeks

    First week - The backup is a Full backup

    Second week - Backup is a Full backup or is incremental backup (synchronization using changed blocks) ?

    Third week - Backup is a Full backup or is incremental backup (synchronization using changed blocks) ?

    fourth week - Backup is a Full backup or is incremental backup (synchronization using changed blocks) ?

    And now important question :)

    After the fouth week, let's say that the first week the backup was Full, and the rest of the weeks (2,3,4) were "incrementals". After the retention period end, is going to remove the Full backup of the first week, so if the others are "incrementals", how can I full recover the virtual machine from 3 weeks ago.

    Obviously I know I can recover the machine. But if anyone would know how it works, to understand what it does, it would be helpful.

    Thank you in advance!!







    Wednesday, December 10, 2014 4:26 PM

Answers

  • Hi,

    All DPM Disk to Disk (D2D) backups are considered incremental due to the way DPM does block level tracking.  So when you protect a VM for the first time DPM will perform an initial replica (full backup) - and from that point on, only block level changes are transferred and applied to the replica.  All recovery points are VSS shadow copies that contain only the changes between recovery points.  Restores are point in time, so it's always a full restore of the VM at the time the recovery point was made.

    To get the concept of express full backup technology - please review this Streaming Video (10 minutes) -- How DPM 2007 protects data 


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.

    Tuesday, December 16, 2014 11:08 PM
    Moderator

All replies

  • Hi,

    All DPM Disk to Disk (D2D) backups are considered incremental due to the way DPM does block level tracking.  So when you protect a VM for the first time DPM will perform an initial replica (full backup) - and from that point on, only block level changes are transferred and applied to the replica.  All recovery points are VSS shadow copies that contain only the changes between recovery points.  Restores are point in time, so it's always a full restore of the VM at the time the recovery point was made.

    To get the concept of express full backup technology - please review this Streaming Video (10 minutes) -- How DPM 2007 protects data 


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread. Regards, Mike J. [MSFT] This posting is provided "AS IS" with no warranties, and confers no rights.

    Tuesday, December 16, 2014 11:08 PM
    Moderator
  • Hi Mike,

    Thank you very much for your answer.

    Thursday, December 18, 2014 11:01 AM