XenServer: Backing up VMs to NAS

Currently we are using XSBackPro 2.0 to backup our XenServer VMs to our NAS. Problem is XSBackPro 2.0 and 3.0 have been discontinued and the support has been halted. We are looking for alternatives to back up our VMs to our NAS. I have not been able to find any software regarding that.

We can take internal snapshots in the XenServer/-Center, but we have no possibility to export those to our NAS. Is there a 3rd-party software to allow us to do it?