ICal/Calendar data deleted during sync with MM

Question

Somehow I managed to delete the contents of nearly all my calendars last night.  They're gone on all my handhelds and from my iMac - there is still a nearly-complete copy on one of my MacBooks.  I shut off wifi on that computer until I can figure out a way to fix this.
Based on reading other Q&A, I believe that I have to either use the iCal Backup command for each calendar, delete the calendars in iCal on that MB, and then reimport them and sync with MM.  I also thought there might be a chance that I can just back up the calendar files that are in my Library, delete the calendars in iCal on the MB and reimport.  It may be possible that I could just back up the calendar files in the Library and reopen the sync to MM and see what happens - I can then force the sync to use the data that's on my computer.  I'm leery of doing that last one because I don't know what will happen when I turn wifi back on to allow the sync to happen - I'm afraid that the MM contents (now nearly empty) will wipe out the iCal information on the MB.
I think this all happened because I was syncing a large amount of data from 2Do on my iPhone to MM Calendar (or so I thought) and the latest update from 2Do had reset the default sync server address to be in iCloud.  I'm in the process of moving to the cloud, but so far all I've done is updated my iPhone and iPad to iOS5.1 (within the past couple of days).  After that sync process went on for some time, I got a sync error from either iOS5.1 or from 2Do, and in response I chose the "revert to server" option (instead of the "use the data on my computer" or whatever it said), and by that time my MM calendar was toast.  Everything was working just fine up to that moment, and I've been slowly getting ready to move to iCloud in the next day or two.  This problem won't stop that if I can get the calendars restored - I have far too much information in iCal to just ignore the matter and move on.
So my question is whether or not the process outlined in paragraph 2 above is the appropriate approach to repairing this inconvenience, or if there's a better way to do it.

Answer 1

Greetings Mike,
Something has gone wrong in the sync process. 
As you indicate your best set of data is on your MacBook I would suggest:
Make an iCal backup:  Click on each calendar on the left hand side of iCal one at a time highlighting it's name and then going to File Export > Export and saving the resulting calendar file to the desktop of the computer that still has calendars.
Go to me.com and add 1 new blank calendar
Delete all calendars but the 1 new blank calendar (this removes any potentially corrupt data being stored in MobileMe).
Turn WiFi back on on your Macbook and go to Calendars > Refresh All -- The calendars that were feeding from MobileMe should vanish as you deleted them from the server.
Go to File > New Calendar > MobileMe and create a new calendar for each of the ones you exported from iCal do your desktop.
Double-click each of the calendars you exported to the desktop one at a time and import them to the new calendar place holder you created for them in step 5.  Allow each calendar to import and upload to MobileMe before you go to the next calendar (this may take some time depending on your Internet connection upload speed which is traditionally low for most consumer level ISPs.)
Side note:
Your profile here says you are running 10.6.7.  I assume you have upgraded to Lion as that is required for iCloud: http://support.apple.com/kb/HT4759
If you haven't upgraded to Lion: http://support.apple.com/kb/HT4949 you will want to do that before MobileMe service ends in June.  Keep in mind before upgrading you want to make sure all your commonly use Applications are Lion compatible and that you have a current backup of your data: http://support.apple.com/kb/HT1427.
Hope that helps!