Problem in --backup-dir option

[Chandra Prabha]

Hi all,
  I am getting problem with --backup-dir option in rsync.
I want to take backup of the file before i am synching the new changes.
I am using -b option. And i am specifying the backup dir and suffix for the 
file also.
Backup is taking for the old back up files also.
So i am getting directories inside directories in a loop.

Kindly help me to get rid of this.
Thanks for any help.

Regards,
Chandra Prabha.A