Backup VM (Base image + snapshot)

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Hi, 

In my VDI environment I have configured the suggested ceph design/arquitecture:

http://docs.ceph.com/docs/giant/rbd/rbd-snapshot/

Where I have a Base Image + Protected Snapshot + 100 clones (one for each persistent VDI).

Now, I'd like to configure a backup script/mechanism to perform backups of each persistent VDI VM to an external (non ceph) device, like NFS or something similar...

Then, some questions:

1.- Does anybody have been able to do this kind of backups?
2.- Is it possible to export BaseImage in qcow2 format and snapshots in qcow2 format as well as "linked clones" ?
3.- Is it possible to export the Base Image in raw format, snapshots in raw format as well and, when recover is required, import both images and "relink" them?
4.- What is the suggested solution for this scenario?

Thanks a lot everybody!
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