Unable to perform backup for image file stored on CD/DVD
I backup my files in a portable hardisk and had successfully updated my backup twice using differential backup. However, when I attempted to conduct another differential backup today, I got a error message informing me that the program was unable to perform full, incremential or differential backup for image file stored on CD/DVD and I was advised to copy my backup files to local hardisk if I want to complete my current backup task.
I've no idea what this means as I'm not using CD/DVD to back up and also I'd completed backup procedures before without any problem. Would be much grateful if anyone can give me a hand on this. Thanks for the help in advance.