Does Time machine not backup iCal data?

My MacBook Pro battery charger has failed, so I did a latest Time-Machine backup, and then connected the backup drive to my Mac Mini.
Imagine my delight when I found that the backup disk, with ten backups on it, contains none of the iCal filels, e.g. Home.ics or Work.ics
What am I supposed to do?

Hi John,
Thanks again for your thoughts.
Once again, this seems to behave in an anomalous way; the heading "Original:' doesn't appear in the 'More info' box.  I made an alias of a file taken at random on the Mini drive, and sure enough there, in the 'More info' was the 'Original:' heading followed by the address of the file for which I'd just made the alias.  The icon for the alias has a little arrow pointing North-east, just like the one in my backup file.
I don't know whether it may be indicative, but the headings in the 'Calendars Info panel are:
Kind: Alias
Size: 4 KB on disk (464 bytes)
Where: /Volumes/My Passport/Backups.backupdb/User's MacBook Pro/2011-05-03-103202/Macintosh HD/Users/tonyjackson/Library
Created: Thursday 9 September 20010 22:58
Modified: Thursday 9 September 20010 22:58
This in the backup folder called: 
2011-05-03-103202
Which seems a bit peculiar?
Best regards, Tony J.

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