iTunes could not back up the iPhone because not enough free space is available on this computer

iTunes 11.0.1 (22)

Mac OS X 10.6.8

218.83 GB available

iOS 6.0.2

iPhone5

 

I get this error occasionally since getting the iPhone5 in October. My last successful back up to thei Mac was yesterday. Tonight, no backup.

 

One time when this occurred I had trashed files, and after I emptied the Trash the sympton went away. Tonight I had files in the Trash and emptie the Trash before connecting my iPhone and now no backup allowed.

I have quit and relaunched iTunes, and unconnected and connected the iPhone tonight with no change in the symptom.

 

My next counter measure will be to reboot.

 

Any suggestions?

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