US Patent 9858154 Agentless file backup of a virtual machine

A method, computer program product, computing system, and system for virtual machine backup are described. In part, the disclosure relates to methods and systems for performing backup of virtual machine files on a block level that include features that allow a user to select and backup specific files or folders of file systems of a VM. The specificity and selectivity features by which certain files or folders are backup from a file system of a VM can be implemented by processing one or more partition structures of a virtual disk of a virtual machine. Once the partition structures have been processed and analyzed using a backup up software application, it is then possible to detect and process guest file systems of the VM.