[sheepdog] [PATCH 8/9] Doc. "Sheepdog Advanced" add chapter "more about backup"

[Valerio Pachera]

Signed-off-by: Valerio Pachera <sirio81 at gmail.com>
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 doc/more_about_backup.rst |   31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 doc/more_about_backup.rst

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+More About Backup
+=================
+
+Cluster Snaphsot
+****************
+
+We know already hot to "export" a vdi in a regular file (qcow2/raw etc).
+It's possible anyway to save the whole content of the cluster two steps.
+
+    * Take a snapshot of the vdi you wish to be saved
+    * run dog cluster snapshot
+    
+::
+
+    dog vdi snapshot debian
+    dog vdi snapshot fedora
+    dog vdi snapshot ubuntu
+    
+    dog cluster snapshot save myfullbackup /media/nas/cluster_snaphosts
+    
+**IMPORTANT:** all vdi without a snapshot are not going to be saved!
+
+Restore the cluster snapshot is equally simple
+
+::
+
+    dog cluster snapshot load myfullbackup /media/nas/cluster_snaphosts
+    
+**BEWARE:** this will format your cluster.
+If you created other vdi after saving the snapshot, they will be lost.
+
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1.7.10.4