My old calendar data gets deleted automatically after a few weeks. How do I stop this from happening?
why does the calendar data get deleted after a few weeks on the iPhone and the iPad and the Mac Pro?
iPad 2, iOS 6
On your iOS devices, go to Settings>Mail,Contacts,Calendars>Sync (in the Calendars section) and set this to All Events.
Not sure about your Mac. Try going to icloud.com, opening your calendar, clicking on the gear icon on the lower left and choose preferences, then on the Advanced tab make sure you haven't checked Hide Events next to Old Events.