A computer-implemented proxy server local to a backup target system performs a backup method for a system supporting a plurality of virtual machines. The backup method includes receiving an initialization of a connection over a network from a backup server identifying the system to backup to the backup target system, establishing a communication connection over the network with the system to backup including identifying an interface for accessing data of the system to backup, receiving an image of the system to backup from the backup server, retrieving a data set corresponding to the image from the system to backup over the network, and writing the data set to a local file in the backup target system.