How can I update my iphone 4 and sync on itunes? All I get is :Could not back up the iphone because the back up is corrupt or not compatible with the iphone. -

Trying to update my iphone to v.5.1.1 however it downloads the version but just at the end of updating my phone I get the message: iTunes could not back up the iphone as the back up was corrupt or not compatible.
How can I fix this?
Thanks

The backup and restore from the iCloud was a little unnerving since the restore erased all information from the iPod.  The iCloud backup and restore took a long time, but worked.  I was very grateful.
Trying again to backup to iTunes locally proved to be the same challenging problem.  The same backup to corrupt file was the message.  The status bar showing backup seemed to move faster to start, but then slowed to a creep toward the end before the error. 
When trying to restore a backup in iTunes, the "Restore" button is grayed out since it is looking for a local copy.  Any restore would need to be from the iCloud which already worked but isn't the final solution.
Your suggestions were good, I am just in the same boat.  Any thoughts about doing the following?
1) creating a cloud backup
2) resetting the iPod to factory defaults
3) removing all traces of iTunes from my computer and
4) installing iTunes and setting up iPod from scratch.
This is the next thing on my list.

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