Warning: New bad clusters were found on the hard disks specified for backups. Data on the bad clusters was not backed up ...

Warning:  New bad clusters were found on the hard disks specified for backups.
Data on the bad clusters was not backed up because the clusters could not be 
read. To ensure that all data on the hard disks is backed up, open a command 
prompt, navigate to the hard disks that have bad clusters and then type 
CHKDSK /R to repair the hard disk. After the repair is completed, retry the 
backup.