Added the files

README.md

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+# What is it?
+This is a simple Bash script I made to automatically backup my
+virtual machines on my server. It's working really well for me,
+but there is no guarantee it will work for you.
+The script retains a set number of backups before starting to rotate.
+The backups are named with a date and timestamp and the rotation-number.
+
+
+# Usage
+Replace the made-up names with the name, disktype and diskfile of your 
+real virtual machines.
+
+`NUMBACKUPS` decides how many backups should be retained. The file *rotate.txt*
+keeps track of the rotation.
+
+`VMDISKDIR` is the directory where the virtual machines are stored on the
+server, not the backup dir.
+
+Also make sure to check and/or change the directories to match your
+machine.
+
+Then simple put the script in a cronjob.

qemu-backup.sh

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+#!/bin/bash
+set -e
+
+PATH="/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin"
+TODAY=`date +"%F-%s"`
+
+#### Change these variables ###
+NUMBACKUPS=3
+VMS=(     "orbit"            "red-dwarf"        "elektra"                 "lisa"          )
+DISK=(    "sda"              "vda"              "sda"                     "sda"           )
+DISKNAME=("orbit-disk1.raw"  "red-dwarf.qcow2"  "elektra-disk1.raw"       "lisa-disk1.raw")
+
+BACKUPDIR="/data/vm-backups"
+VMDISKDIR="/vm"
+XMLDIR="/etc/libvirt/qemu"
+
+
+### Program start ###
+SCRIPTDIR=`pwd`
+
+
+if [ ! -e ${SCRIPTDIR}/rotate.txt ]; then
+    echo 1 > ${SCRIPTDIR}/rotate.txt
+fi
+
+ROTATE=`cat ${SCRIPTDIR}/rotate.txt`
+
+if [ $ROTATE -gt $NUMBACKUPS ]; then
+    ROTATE=1
+fi
+
+for (( i = 0; i < ${#VMS[@]}; i++ ))
+    do virsh snapshot-create-as --domain ${VMS[i]} --diskspec ${DISK[i]},file=${BACKUPDIR}/${VMS[i]}-snapshot.qcow2 --disk-only --atomic --no-metadata
+    sleep 5
+    rm -rf ${BACKUPDIR}/backup${ROTATE}-*-${DISKNAME[i]} 
+    cp ${VMDISKDIR}/${DISKNAME[i]} ${BACKUPDIR}/backup${ROTATE}-${TODAY}-${DISKNAME[i]}
+    virsh blockcommit ${VMS[i]} ${DISK[i]} --active --verbose --pivot
+    sleep 5
+    rm ${BACKUPDIR}/${VMS[i]}-snapshot.qcow2
+    rm -rf ${BACKUPDIR}/backup${ROTATE}-*-${VMS[i]}.xml
+    cp ${XMLDIR}/${VMS[i]}.xml ${BACKUPDIR}/backup${ROTATE}-${TODAY}-${VMS[i]}.xml
+done
+
+ROTATE=`echo "$ROTATE + 1" | bc`
+echo $ROTATE > ${SCRIPTDIR}/rotate.txt
+