====== Qemu Snapshots ======

  * To create a snapshot of BACKING_IMG.qed run the following command.  Then use SNAP_IMG.qed as the source image in the vm.  All changes will be written to SNAP_IMG.qed and BACKING_IMG.qed will be unmodified.
  * Running the same command will create a new snapshot and discard all changes to BACKING_IMG.qed
  * **qcow2** and **qed** support snapshots
<file>
qemu-img create -f qed -b BACKING_IMG.qed SNAP_IMG.qed
</file>
  * You can chain snapshots so that following command would make a snapshot of a snapshot
<file>
qemu-img create -f qed -b SNAP_IMG.qed SNAP_OF_SNAP_IMG.qed 
</file>