To remove this issue, make sure the temporary directory for CB backup is set to the base FTP directory for FTP sharing. If you select a subdirectory under the base directory, this issue occurs.
For example, an FTP site uses base directory E:\ftp1 for file sharing. This base directory contains a subdirectory named Localuser.
When you use this FTP site for CB backup, you must set the temporary directory to E:\ftp1. If you set the temporary directory to E:\ftp1\LocalUser, you would receive an insufficient disk space error message.