Yes, Carbonite does support backups of external hard drives. When using Carbonite, users can configure the software to include external drives in their backup plans, allowing for the protection of important files stored on those drives. The process generally involves connecting the external hard drive to the computer and then ensuring that the backup settings within the Carbonite application include the external drive in the selected items for backup. It is important for users to verify that they have sufficient backup capacity in their Carbonite plan, as external drives can contain significant amounts of data. For the most accurate and current information regarding configurations or specific features, users may want to consult the official Carbonite website or refer to the help section available there.