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Update delta_backups.md

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Olivier Lambert 2015-11-19 16:14:09 +01:00
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delta_backups.md
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> This feature will be out when delta VHDs will be officially supported by Citrix, in XenServer (Dundee).
The next version of XenServer will support delta VHD export. It means you can export only the delta between your current VM disks and a previous snapshot.
The next version of XenServer will support delta VHD export. It means you can export only the delta between your current VM disks and a previous snapshot (called here the *reference*).
It's very similar to VEEAM *Forward Incremental Backup*, as explained in [their documentation](http://helpcenter.veeam.com/backup/80/hyperv/forward_incremental_backup.html):
@ -16,6 +16,10 @@ You can imagine to make a full backup during a weekend, and only delta backups e
* they are small
* easy to restore
So, if you want to rollback your VM to a previous state, the cost is only one snapshot on your SR (far less than the [rolling snapshot](rolling_snapshot.md) mechanism).
Even if you lost your whole SR or VM, you can use a Full backup to restore it completely, then apply any existing delta on top!
## Challenges
* XenServer delta VHD support