BB8900 data fine - iCal shot to pieces

Hi
I have a Curve 8900 and use a Mac PPc with 10.5.8 and Missing Sync for BB. The data on my curve is accurate and up to date. My contacts and notes on the Mac are fine but my first and only sync shot my iCal data to pieces. It is now of no use and out of date. Is there any way I can:
1. Force a sync with BB overwrites iCal ( I don't think so? )
2. At least backup the BB data without doing any sort of syncing?
Any help / suggestions / advice would be warmly welcomed!!!
Many thanks
Tony:(:confused:

BB8900 data fine - iCal shot to pieces - HELP!