Basic situation is I have a Samsung Galaxy (i5503T) upgraded to Froyo using the official release via Kies.  Due to the original user getting a new handset, I want to set up the galaxy for another household family member to use, including their own Gmail account and calendar.  

I cannot however for the life of me get it to bring up the calendar on the second account, the only options I get when I go into the account settings are email and contacts (which both work just fine).  I have disabled the primary account and removed the calendar data through the apps manager but still the primary account is the only one with a calendar option.

Surely it should be able to handle a second Gmail calendar?

Other option I guess is to remove the original Gmail account and make the new one the default.  However as I understand it the only way to do this is to factory reset the phone which wipes everything (surely not!).  I really can't be bothered downloading all the apps and setting the whole thing up again, and I don't see why I should pay again for apps already purchased.  

So...any help appreciated:

1. How can I get the second Gmail calendar to show up?
2. If not possible is there a way to change the default Gmail account without wiping the whole phone?
3. If that is not possible is there an easy way to back-up the whole phone (apps, contacts, settings etc) do the factory reset, and then put everything back to how it was?

Thanks