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How to online backup 2008 R2 Hyper-V guest OS

Is there any freeware to do online backup guest OS of 2008 R2 hyper-v?
Such as Citrix Essentials for Hyper-V Express version.

I am using DOS batch copy to do the online backup now, the speed is very slow.
Thank you.
3 Solutions
Tony JLead Technical ArchitectCommented:
I'm not aware of any freeware but I would look into Acronis' online offerings. They can supply 1TB of cloud based storage, that supports restore to bare metal, for a few hundred bucks a year.
Did your batch use VSS? Without this copy may be unconsistent.

Also use in script not copy ou xcopy but robocopy for examle.

See script examples in article:

Svet PaperovIT ManagerCommented:
Windows Server Backup (GUI) and wbadmin (command prompt) support online backup of guest machines. You will have to register the Hyper-V VSS Writer only. WSB allows daily backups only, while wbadmin can be scripted in Task Scheduler.

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