Ever since upgrading to BUE2012 an IMG0000x directory is being created in the root directory on my external USB drives backup drives. Each Directory is about 8GB in size and is taking up a lot of space. There is one directory for each day I had the drive hooked up and performed a backup. Its using up my space quickly. What is it? Do I need it? I am backing up one MS/SQL database server. no other servers on network.