DS-Client Help : Working with backups : Salesforce backups (Windows) : General requirements
 
General requirements
You must have a valid Salesforce account (username, password, and security token).
Your Salesforce product must be an edition that allows API integration.
NOTE:  If you need to change your Salesforce password, you must obtain a new security token from the Salesforce website. All existing Salesforce backups must be updated with the new credentials.