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Update delta_backups.md

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Olivier Lambert 2015-12-18 18:07:39 +01:00
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delta_backups.md
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You can export only the delta between your current VM disks and a previous snapshot (called here the *reference*).
## Introduction
Full backups can be represented like this:
![](https://xen-orchestra.com/blog/content/images/2015/12/nodelta.png)
@ -25,4 +27,12 @@ You can imagine to make a full backup during a weekend, and only delta backups e
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!
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!
## Create Delta backup
Just go inside your "Backup" view, and select Delta Backup:
![](https://xen-orchestra.com/blog/content/images/2015/12/delta_menu.png)
Then, create in like a normal backup.