Upon syncing my iPhone and mac all of my ical and iPhone calendar events have duplicated. how can i fix this and avoid it in the future?

upon syncing my iPhone and mac all of my ical and iPhone calendar events have duplicated. how can i fix this and avoid it in the future?

Greetings,
Questions:
1. What version of the Mac OS are you running (Apple > About this Mac)?
2. What version of the iOS are you running (Settings > About)?
3. Do you backup your computer (http://support.apple.com/kb/HT1427)? 
--- If you don't regularly backup your computer, now is the time to start.
4. Do you backup your iPhone (http://support.apple.com/kb/ht1766)?
Check the calendar list on the left hand side of iCal.  Is it that the individual events are duplicated or is it just that you have the same calendar listed more than once?  If its that you have more than 1 copy of each calendar, you can delete one of the duplicate calendars to eliminate the duplicates.
If you find that it is the individual events that are duplicated then there are 2 options:
1. Restore your computer iCal database or iPhone from a backup made before the duplication occurred.
2. Use a duplication removal program (or do it by hand) to remove the duplicates: http://www.nhoj.co.uk/icaldupedeleter/
If you have a backup made before the duplication occurred, reply back with what kind of backup you have and I'll suggest how to recover the calendars.
To avoid this issue in the future:
Keep regular backups.  They are your best defense against data anomalies which are a fact of life in computers (although hopefully rare).
Keep your computer and iPhone software fully up to date (Apple > Software Update / Settings > General > Software Update).
Make sure the date and time on your computer and iPhone are correct before you sync the two devices.
Make sure the cable connections between the two is solid and that the cable shows no signs of physical damage.
Hope that information helps.

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