I'm using the Calendar app that came with the phone. I just figured out how to backup new events to Gmail- when you create a new event, choose "Gmail" instead of "PC Sync." Unfortunately, "PC Sync" was the default selection for every event I've ever created up until now. I can't figure out how to back these events up. I downloaded the HTC Sync software to my PC and successfully used it to back up my contacts. However, I cannot find an option anywhere in HTC Sync to backup Calendar. Any ideas?