On occasion you may find that you need to run the Rebuild Datafunction of QuickBooks (File / Utitlities/Rebuild Data) to correct a problem. This straightens out a number of odd problems that can occur over time. The first thing that QuickBooks will do is to have you make a backup, which is a good thing.
Unfortunately, sometimes the backup procedure will fail due to an error in the data (which is probably why you were doing the rebuild in the first place). What can you do?
First, make a physical backup of your company file – the QBW file. Put it in a safe place.
Next, when you select the File/Utilities/Rebuild Data command, hold the control key downwhen you click on that menu option. QuickBooks will then skip the backup step, and proceed on to the rebuild.