Dev License: This installation of WHMCS is running under a Development License and is not authorized to be used for production use. Please report any cases of abuse to abuse@whmcs.com
Backup is an extra copy of data (that is stored separately from the original) made as a precaution measure in cases when the original data is lost or becomes unusable/unavailable. In hosting it refers to the practice of making copies of the content that is uploaded to the server in the event of server crash or hard disk failure.