Norton Save & Restore does not recognize new external drive

I have replaced my external hard drive that Norton Save and Restore 2.0 uses for storing backup files with a larger drive.  My Files and Folders backup continues to backup incrementally, instead of starting over and backing up everything for the first time.  I have deleted the backup job and recreated it, but it still will not make a complete backup.  I’ve had this issue before, and believe deleting the index file fixed it.  Is that the right solution?  If so, can somebody please post the steps?  Thanks.