diff --git a/libvirt-zsh-backup.sh b/libvirt-zsh-backup.sh
index 431e320..2691df6 100644
--- a/libvirt-zsh-backup.sh
+++ b/libvirt-zsh-backup.sh
@@ -31,5 +31,13 @@ fi
 
 DATE=$(date "+%Y%m%d")
 DATE30=$(date -d "-30day" "+%Y%m%d")
+SNAPNAME="backup_$DATE"
 
+VMDISKS=$(virsh domblklist $VM | egrep -o vd.)
+DISKSPEC=""
+for disk in $VMDISKS
+do
+    DISKSPEC+="--discspec $disk,file=/srv/snapshots/$VM/$VM-$disk-$SNAPNAME.qcow2,snapshot=external "
+done
+echo $DISKSPEC