Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

We're in the middle of P2V'ing most of the network, so the current backup method is likely the worst - the backup agent is still installed on the guest OSs, and the backup device is dutifully pulling them onto tape, one file at a time.

I suspect there's a clever way to script (PowerShell?) a suspend on the VMs, then backup of the .vhd files, and unsuspend the VMs. This seems like it would provide big speed benefits, while losing file-level restore (might be best for things like DCs and app servers).

What methods/policies have you hammered out?

share

locked by sysadmin1138 Sep 13 '12 at 11:58

This question exists because it has historical significance, but it is not considered a good, on-topic question for this site, so please do not use it as evidence that you can ask similar questions here. This question and its answers are frozen and cannot be changed. More info: help center.

11 Answers 11

up vote 7 down vote accepted

Regular file-level backup of only data should still be used - regardless of if the machine is virtual or not. Backing up the disk file however is a great aid in increasing recovery speed for disasters if the entire guest fails.

There are several approaches to backing up the guests with scripting. You could shut it down, copy the vhd and start it again. A clean system backup. But what you probably want though is creating a snapshot. There's also a mount tool to get to the shadow copies programatically so you could actually move them off the volume as well. There's some debate on how stable the VSS-based snapshot system really is and people have lost data. It's a bit (ok, much more) involved than the approach used by Vmware as far as I can tell and is a bit more annoying to deal with.

I think there's a service pack or patch to the Windows Server 2008 Backup tool that makes it capable of backing up the guests transparently by the way?

Also see Microsofts planning for Backup with Hyper-V.

share
    
If you shut down the server before taking a copy of the vhd, it is a consistent (not crash-consistent) backup. –  Neobyte Jun 13 '09 at 19:00
1  
In the end, continuing with backups as usual is going to be the practical solution until the virtualization project is done. Rehashing backups entirely will be a completely new project... –  Kara Marfia Jun 14 '09 at 1:10
    
Many good backup solutions will backup the images both ways. Microsoft's own Data Protection Manager works well if you do D2D short term backups (or long term with a removable drive). –  Chris S Apr 1 '10 at 23:29

I would recommend HVbackup:

The main goal of this project is to provide a very easy and powerful free tool to backup and restore Hyper-V virtual machines, in standalone and clustered (CSV) environments, overcoming all the limitations that a generic tool like Diskshadow provides.

share

I disagree. I found the cheapest solution is the one that saves backup storage space in the long-term. We found a nice tool for this after a long time of browsing and experimenting and I documented it on my blog here: How I Backup Virtual Machines

Hope this will help someone Peter

share
    
Not sure why that site 404's your link, but that looks good, can't wait to dig into it. –  Kara Marfia Apr 4 '10 at 1:23

BackupAssist is another very good tool. Sql Server backups, Hyper-V backups, restore individual files from entire guest backups, etc.

share

I've just ran a Windows Server backup to backup a newly running Hyper-V host which only has a couple of VMs. Job ran fine. I'm just restoring to a test server now. The only downside is that I have to restore the entire set of VMs.

I saw on this blog: http://blogs.msdn.com/taylorb/archive/2008/08/20/backing-up-hyper-v-virtual-machines-using-windows-server-backup.aspx that the guy was somehow able to restore an individual VM from the command line tools. I can't quite make out the commands he used since it was only in a small image. So any suggestions on what he did to restore a specific VM would be helpful if anyone knows.

share

ARCserve Backup r12.5 id the best solution for VM backups as it can do File Level Restores from Raw/Image Level Backups of Virtual Macines. Also, with the latest Vsphere Patch it sends data straight from the ESX stores to Tape and back without a VCB Proxy.

share
    
ESX? If only I were so lucky. ;) –  Kara Marfia Jan 26 '10 at 14:42

I'm unable to reply to the comments above, so I'll add a few general comments here.

So, in no particular order:

I rather like Windows Server Backup - it gets a lot of stick for dropping tape support but got me out of a jam following an unnoticed RAID5 failure recently. Unfortunately, there's a hard limit of 2TB per volume if you want a block level volume recovery. Any more than that and you're stuck with file/directory selection. The version that ships with R2 isn't bad at all - it's not Backup Exec, but frankly, I could never be 100% sure that BE was actually working and what I want are point in time deltas, not a tape era 3-generation model.

DPM - I may be mistaken but last time I checked I don't think it had support for USB attached storage. In a data-centre, perhaps that isn't an issue, but if you can get DPM for free on one of the MS subscription products, what could be a feature rich, low cost option isn't available.

share
    
DPM still does not support USB storage. –  icky3000 Apr 2 '10 at 0:01

I did exactly what you said. Each night, I shut down the VMs, then do an export and restart the VMs. Then I copy the exports to some other physical location. This is a powershell script that is scheduled with Windows scheduler. The only drawback is that you have to shut down while exporting - which is not always acceptable.

share

We use System Center Data Protection Manager (DPM) for backing up our Hyper-V machines. It's not exactly a 'cheap' solution but we've found it to be excellent.

You can configure it to automatically take snapshots at varying intervals of your virtual machines. Restoring a virtual machine from a previous time is also a breeze. We have a SAN for DPM's primary storage, but in addition, we also have a decent tape library (which DPM integrates with very nicely) which stores older generations of our VMs.

Additionally, DPM has specific support for SQL/Exchange backups. Certainly works a treat if you have the resources.

share
    
I had no idea this existed, thanks! –  Kara Marfia May 7 '09 at 12:35

The easiest (and cheapest) method is to just use Windows Server Backup in Server 2008.

How to back up Hyper-V with Windows Server Backup

Snapshots should be used as a short-term rollback solution and should not be used for traditional backup purposes. See here for a brief explanation.

share

I have yet to configure this myself, however...

If you are using a iSCSI (or other SAN) device then that device can often have a feature to backup live images.

If you don't have this option you can use the Hyper-V VSS Writer in Windows 2008 server backup on the host. See here. Or you can use any backup app that supports VSS writers.

share

Not the answer you're looking for? Browse other questions tagged or ask your own question.