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...Full backups may be done with vmkfstools or by means of Rsync and its Delta algorithm (read: https://33hops.com/blog_xsibackup-rsync-considerations.html), to a local datastore or over TCP/IP tunneled through SSH, so any transfer over IP is secure.
Provision VMs in QEMU, using ZFS clones for virtual disks
These scripts run from any webserver (eg, nginx) on a FreeBSD host with a zpool configured. VMs are cloned from ZFS snapshot and exported via iSCSI. A qemu process on a (linux) hypervisor host is created via ssh (keys), with the qemu process being the iSCSI initiator.
CASIMIR is a web-based PHP/MySQL interface which controls over SSH-secured connexions qemu/kvm virtual machines dispatched over several physical servers. It also provides to administrators the ability to delegate control of these machines to other users.