If you are looking for free VMware backup solution then have a look on this software i.e. Ahsay software. Ahsay VMware backup module is designed for using in conjunction with AhsayOBM for fast and secure backup of guest virtual machines in VMware vSphere (ESX / ESXi), Server, Workstation, Fusion, and Player. VMware vCenter is supported by the latest AhsayOBM. Therefore, backup can be done with or without vCenter, depending on your configuration. VMware vCenter supported. The ONLY solution that supports vSphere (ESXi) Free version. Online backup of guest virtual machines, without interfering operation.