Found this on SPB's website:
Quote:
Can I restore my data after the ROM upgrade?
unfortunately, Spb Backup doesn't officially support restoring after ROM upgrade. You can do it on your own risk. Restoring program files and registry settings may interfere with newer versions of software that could have been installed on your device during the ROM upgrade and could make your device work unstable. That's why we recommend to restore only files from My Documents. In some cases you can try to restore mail folders and PIM data.
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So it might not be as simple as excluding System Data...Even PIM data isn't guaranteed to work according to this.