Backing up SSAS Database; Insufficient space

  • Does anyone know if SQL Server takes into account the size of the backup file it is overwriting in the case of backing up an SSAS database?

    Scenario:

    SSAS Version: 10.50.2811

    Existing backup: SSASDatabase.abf 65.2GB

    Free Space on Drive: 99GB

    XML: <Backup xmlns="http://schemas.microsoft.com/analysisservices/2003/engine">

    <Object>

    <DatabaseID>SSASDatabase</DatabaseID>

    </Object>

    <File>\\Share\Folder\SSASDatabase.abf</File>

    <AllowOverwrite>true</AllowOverwrite>

    </Backup>

    This fails with an insufficient space error. To make the job run successfully, I delete the existing backup and run the job from this step. The initial file size before compression now is 117GB! More than double the final result of 65.2GB.

    Question 1: Is the XML correct for this? (a developer wrote this and I am not too familiar with doing these backups)

    Question 2: Does it not take into account the space of the file being overwritten as free space? This seems probable, given the error. However, I would like to know if this can be verified. (I've googled, but my google foo on this is lacking)

    Any help would be appreciated!

    Jared
    CE - Microsoft

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