I had to recover my hard drive from a Time Machine backup, and when everything looked like it was working I noticed that all my iCloud calendars were duplicated in the side bar. Without thinking, I deleted one of the duplicates keeping just one. In Calendar, it looked like I had cleaned things up, but the next time I restarted Calendar, they were all gone. Looking at my iPhone, they had been removed there too, as well as on iCloud.com. I'm able to recover all the calendars from the Time Machine library, but since iCloud.com seems to be the master, my shared calendars on my Mac will be erased as soon as iCloud synchronizes. I could export each calendar to ics (just before they are deleted), and the import them, but doing that for shared calendars doesn't seem to reinstate the subscription. Is there any way I can force my calendars on my Mac to overwrite the master on iCloud.com?