I singed a new client yesterday, and oh man are they in a world of hurt. They are running a Dell PowerEdge T610 with RAID 10, dual hot-swap power supplies and 12GB RAM. They are running XenServer 5.5.0 with two VMs. On my first site visit, the immediate things that jumped out - one drive failed in the RAID and one power supply is bad - I replaced both items and things are now stable. Further review shows they have zero backups whatsoever of the VMs. This is my first time managing a XenServer. What backup solutions are available for XenServer VMs?