Even after updating to the latest software (2.1), iPod Touch still takes a long time to backup.

There is a free software that you can download that can disable and enable backup by just a click of a button. It’s called Backup Disabler by TwelvePin.

It’s described by the developer as:

The balance between backing up your latest saved game or text messages and waiting an hour for your phone to sync is a delicate one. Now, you can easily sync without waiting for the backups, and just as easily re-enable them whenever you like.