ISync synced iCal calendars to phone but erased from computer. Help!

Question

I performed a sync today to my Motorola E815 cell phone. All of the contacts synced fine but the calendars didn't. All of the calendars from iCal were copied over fine, but the no longer appear in iCal.
Will syncing again copy the calendars back from the phone to the computer or will they erase off of the phone and no copy over. I am scared of losing them altogether. I could reenter them manually but that would take forever. Is there anyway to get my calendars back?
I had performed a backup of iCal a few weeks ago but don't know how to revert to that, plus I have made several changes since then.
What can I do?

Answer 1

If you created the backup using the the option labeled Back up Database… under the File menu in iCal, then restoring that data is as easy as choosing the option labeled Revert to Database Backup… directly beneath it. If you used another means, restoration might be a little more complex. It depends entirely upon what you originally chose to to, as a restoration is effectively a reversal of this process.
In any event, to restore the information on your mobile handset to iCal, you should reset the synchronization framework by…
• launching iSync
• opening the Preferences… dialog
• pressing the Reset Sync History… button and following the instructions which appear
You can achieve the same effect by removing your device from iSync and then adding it back. The key is to select the option to Merge the data in iCal with your mobile handset, rather than to Replace the data on your mobile handset with the data stored in iCal, which is presently empty.
If you do first successfully restore iCal and elect to merge your data, it will recognize equivalent records and merge them, and will add the records which differ on either device to the other.
The key to a successful outcome is to proceed slowly and deliberately, follow any instructions which occur, and ponder the likely outcome as you move forward. Generally speaking, you can stop at any point and back out of the process without affecting your data, though once you have reset or removed and then added back your device, the framework will eventually have to accommodate this change, and will perform a full, slow synchronization the next time you try to synchronize. Again, at that point if you cancelled earlier, you will have to elect to merge rather than replace data.