I know by this time that there is no way to down grade from 3.0 to 2.2.1.
So, can any one tell me how to take the back up of the iPhone device with 2.2.1.
Thank you All.
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You will not be able to restore from that backup to get 2.2.1 after you have upgraded to 3.0.
However, if you want to make a backup, simply connect your phone to your PC or Mac and itunes should back it up automatically.
If it doesn’t, right click on the iPhone icon in the left panel of iTunes and select “Backup”.
The backup will back up your settings and documents, and you might be able to restore those using that backup.
To restore, connect your iphone and hit the “Restore” button in the iTunes page for your phone.