If you encrypt an iPad backup in iTunes and then forget your password, you will not be able to restore from backup and your data will be unrecoverable. If you forget the password, you can continue to back up and use the device, however you will not be able to restore the encrypted backup to any device without the password. You do not need to enter the password for your backup each time you back up or sync.
If you cannot remember the password and want to start again, you can use a SmartKey iTunes Backup Password Recovery to unlock iTunes backup password at first. Check out http://goo.gl/22kaq for more details
If your iPad says "disabled" when you turn it on and cannot also connect to iTunes, you need to restore it. Here is a link you can refer to for guidelines on how to restore if you have forgotten your password: http://support.apple.com/kb/ht1212.