DP9 - Spec and requirements

Hi,

In the SPEC of DP9 (http://www8.hp.com/h20195/v2/GetDocument.aspx?docname=c04109270), page 5. I  can read :

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1.5 GB of free disk space + approximately up to 2% of planned data to be backed up (for use by the IDB)2 × size_of_the_bigge st_package_to_be_installed + 10 MB of disk space needed on the system driveOn Windows Server 2008 systems, the firewall must also be configured to accept "Remote Service Administration" (NP) connections (port 445)

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About the 2% of planned data to be backed up (for use by the IDB), what does "planned data" mean ?

1. Is it the capacity of all my data on prodct disks that I want to backup ?
2. Is it the capacity of all my data which will be on tapes with all versions ?

Is my question comprehensive ?

Thanks for your help.