hyper-v backup

i have two servers that hosted 6 virtual server using hyper-v
the vhd file in located on the servers,
what's the best solution for backup it ?
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Also any backup program that can take advantage of using the Volume Shadow copy should work just fine.
aminbaikAuthor Commented:
so i can use nt backup right ?
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You can use NT backup - but you might want to look into backup exec 2010. it has an integrated license for VM, You would need one license per host and it is able to backup all your VM's you have running.

it also uses deduplication so that the amount of data is replicated across the servers.

sorry I didn't explain the deduplication option correctly.

Iif you have two windows 2008 servers and you have selected the same windows data to backup on each machine it only backup the one copy and then any little change to the other data. it effectively reduces the amount of data you are backing up.

Here si a little write up on the de dup option http://eval.symantec.com/mktginfo/enterprise/white_papers/b-be_2010_deduplication_option_solution_brief_WP.en-us.pdf

You don't sound like you have a huge server farm. Check out this backup software with deduplication. As David suggested, the deduplication saves spaces from backup cycle to backup cycle. If you only have two servers, you could back them up to one another. Using a differential backup scheme you could benefit from having a long backup history and use far less space than with ntbackup.
There are two backup senarios to look at here.
1. You backup each host  or
2. You backup the Hyper V Host and all the VHD's.

Your strategy will depend greatly on your need to recover data.  ie Do you need to recover data that a user has inadvertantly deleted (you are propably covered here by Volume Shadow Copy)
If this is not something that you need to do on a regular basis then backing up the VHD's for disaster recovery is an option.
You will also need to look at the volume of data that needs to be backed up and the time window available.
Backups now tend to be a two staged affair.  ie Disk to Disk to Disk or
Disk to Disk to Tape.  This is now the preferred option to expidite the time taken to backup a Server and offer better disaster recovery.
Lets take Disk to Disk to Disk for example.
The first disk relates to the disks as seen by the Virtual Guests.  typically you would run software on the guest and have it backup that Server to the second Disk.  The second Disk is preferably a Fixed disk.  The configuration of the backup to the second disk will allow for fast, multiple backups.  The second disk is usually some sort of NAS (or could be another array within the physical server).
The third Disk is used to take a copy of the backup on the NAS to be taken off site.
In this situation Software such as Storagecraft Shadow Protect will backup at the sector level and doesn't care how many sectors it has taken to store a file.  This allows for extremely quick backups as it will only backup what has changed, not the whole file.  You can set your software to backup 300 times a day with each backup only taking a few minutes.
As an added benefit, should your server go down, you can virutal boot your backup image and be back on line in minutes.  Users can connect to the virtual image whist you sort out the actual server.
An alternative to Shadow Protect is Acronis.  I have not used Acronis but believe that they have a similar product.
Bill LouthSystem EngineerCommented:
Windows Backup (free) would work but an ideal solution would be a commercial product.

The most popular is Symantec Backup Exec.

The cheapest option is to use Backup Exec to get the whole physical host server, system state, and .VHD files.  It works with VSS to backup the open files.  I've also used the restore feature in Backup Exec to clone Virtual servers.  However you can't restore individual files.  And it isn't designed to gracefully deal with things like SQL, Exchange, or SharePoint (although we've used it successfully for our test/development environments).

For an even better solution get Symantec Backup Exec Agent for Hyper-V.
One license covers all virtual machines on the host, except for specialty apps like SQL, Exchange, or SharePoint.

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