Agentless backup is a backup and restore process that eliminates the need for individual software installations, or agents, to be installed on target servers requiring protection.  Agent-based solutions are usually more costly because in most cases the software is proprietary to the service provider and needs to be installed on every computer in the network to be backed up. 

Agentless backup uses communication protocols to manage tasks from a single administrator computer for an unlimited number of machines connected on a local or remote network and doesn’t require the management of agent software.  In general, the agentless remote site backup and recovery solutions allow:

• Simple, centralized management of the data protection process while eliminating the capital and operational expenses associated with agent-based solutions. 
  
• Backup performance from a single point of administration, which results in lower costs.  
  
• Businesses reduce backup costs overall by employing disk-to-disk agentless backup and having no licensing fees.