I have a third party to-do manager that I've used for some time that has previously synced to MobileMe, and recently had it start syncing to iCloud after everything was updated to iOS 5 and 10.7.2. Things worked fine for a while until today I noticed on he to-do app that my categories were duplicated on my iPad. I deleted the duplicates and everything seemed ok. Then I used my iPod touch later and found the duplicates were still there even after I synced with iCloud. So, I deleted them again. This time, disaster struck. Not only the duplicates were deleted, but the original categories and their corresponding calendars were deleted as well. Of course, iCloud faithfully deleted the data from my iPad. I knew if I launched iCal on my MacBook Pro, it would also have its calendar data deleted as well, so I turned off Wi-fi and backed up all the calendar data. When I turned on Wi-fi again, the calendar data was deleted, as expected.
So, I tried to restore the backed up data to iCal. Everything worked... then it synced with iCloud and everything I'd restored was deleted again. Multiple attempts give the same results. The only backup data that's easily accessible is on the laptop, although it looks like the iPad data was backed up to iCloud before the disaster struck. I've tried manually syncing calendar data to the iPad then trying to merge its data with iCloud, but it doesn't seem to work right either. I need to get the calendar data back where it was, and preferably all my reminders as well (which seem to be comingled with the calendar data). Any thoughts on what I can do to get things back to the way they were?