Dpm , open source alternative backup solution?

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http://serverfault.com – DPM (Microsoft Data Protection Manager) Do you have an application open source alternative? (With support for SAN). Bacula, Amanda, Clonzilla, etc. .. Is there? I want to take a backup of virtual machines, Citrix XenServer Enterprise. good work. Best Regards. Thank you in advance for your answers. (HowTos)