diff --git a/rpi-clone b/rpi-clone
index 6b28835..3cae887 100755
--- a/rpi-clone
+++ b/rpi-clone
@@ -1,6 +1,18 @@
 #!/bin/bash
 
-VERSION=1.2
+VERSION=1.4
+# Version 1.4 2015/08/16
+#  * add -n (--dry-run) option for rsync
+#  * add -u (--uuid) option to auto-detect disk by UUID. 
+#           System on reboot may change its disk symbol mapping, thus dangerous.
+#           It is more secure searching by UUID.
+# Version 1.3	2015/06/18
+#	* add -q (quiet) option for use as cron script
+#         -q only works with existing backups, 
+#         it won't initialize the destination SD card partitions with dd!
+#         Please initialize the destination SD card from the shell (by hand)
+#         for the first time.
+#         This is to protect you for accidentally overwriting a SD Card.
 # Version 1.2	2015/02/17
 #	* add -x option
 #	* tweak some echo messages
@@ -16,6 +28,9 @@ VERSION=1.2
 PGM=`basename $0`
 
 RSYNC_OPTIONS="--force -rltWDEgopt"
+BLKID="/sbin/blkid"
+TAIL="/usr/bin/tail"
+HEAD="/usr/bin/head"
 
 # List of extra dirs to create under /mnt.
 OPTIONAL_MNT_DIRS="clone mnt sda sdb rpi0 rpi1"
@@ -59,11 +74,14 @@ fi
 usage()
 	{
 	echo ""
-	echo "usage: $PGM sdN {-f|--force-initialize} {-v|--verbose} {-x}"
+	echo "usage: $PGM sdN {-f|--force-initialize} {-v|--verbose} {-x} {-q|--quite}"
 	echo "    Example:  $PGM sda"
 	echo "    -v - list all files as they are copied."
+	echo "    -n - do a dry-run of rsync."
+	echo "    -u - UUID of one of a disk partition, used when disk is not passed."
 	echo "    -f - force initialize the destination partitions"
 	echo "    -x - use set -x for very verbose bash shell script debugging"
+	echo "    -q - use quiet modus to schedule the script as a cron script"
 	echo ""
 	echo "    Clone (rsync) a running Raspberry Pi file system to a destination"
 	echo "    SD card 'sdN' plugged into a Pi USB port (via a USB card reader)."
@@ -96,6 +114,7 @@ usage()
 	}
 
 VERBOSE=off
+QUITE_FOR_CRON=false
 
 while [ "$1" ]
 do
@@ -104,6 +123,13 @@ do
 			VERBOSE=on
 			RSYNC_OPTIONS=${RSYNC_OPTIONS}v
 			;;
+		-n|--dry-run)
+			RSYNC_OPTIONS=${RSYNC_OPTIONS}n
+			;;
+		-u|--uuid)
+			shift
+			DST_DISK=$($BLKID -U $1 | $TAIL -c 5 | $HEAD -c 3)
+			;;
 		-f|--force-initialize)
 			FORCE_INITIALIZE=true
 			;;
@@ -113,6 +139,9 @@ do
 		-h|--help)
 			usage
 			;;
+		-q|--quite)
+			QUITE_FOR_CRON=true
+			;;
 		*)
 			if [ "$DST_DISK" != "" ]
 			then
@@ -143,6 +172,12 @@ fi
 
 unmount_or_abort()
 	{
+	if [ "$QUITE_FOR_CRON" = "true" ]
+	then
+		echo "Sorry, mounted devices in quite_cron mode is not allowed."
+		echo -e "Aborting!\n"
+		exit 0
+	fi
 	echo -n "Do you want to unmount $1? (yes/no): "
 	read resp
 	if [ "$resp" = "y" ] || [ "$resp" = "yes" ]
@@ -246,6 +281,12 @@ if [ "$DST_BOOT_PARTITION_TYPE" != "$SRC_BOOT_PARTITION_TYPE" ] || \
    [ "$DST_ROOT_PARTITION_TYPE" != "$SRC_ROOT_PARTITION_TYPE" ] || \
    [ "$FORCE_INITIALIZE" = "true" ]
 then
+	if [ "$QUITE_FOR_CRON" = "true" ]
+	then
+		echo "Sorry, now new disk setup allowed in quite_cron mode."
+		echo -e "Aborting!\n"
+		exit 0
+	fi
 	CLONE_MODE="rsync all files to $DST_DISK root file system"
 	echo ""
 	if [ "$FORCE_INITIALIZE" = "true" ]
@@ -352,8 +393,14 @@ echo "==============================="
 # If this is an SD card initialization, can watch progress of the clone
 # in another terminal with:  watch df -h
 #
-echo -n "Final check, is it Ok to proceed with the clone (yes/no)?: "
-read resp
+
+if [ "$QUITE_FOR_CRON" != "true" ]
+then
+	echo -n "Final check, is it Ok to proceed with the clone (yes/no)?: "
+	read resp
+else
+	resp="y"
+fi
 if [ "$resp" != "y" ] && [ "$resp" != "yes" ]
 then
 	echo -e "Aborting the disk clone.\n"
@@ -369,7 +416,7 @@ fi
 # Mount destination filesystems.
 
 echo "=> Mounting $DST_ROOT_PARTITION ($DST_ROOT_VOL_NAME) on $CLONE"
-if ! mount $DST_ROOT_PARTITION $CLONE
+if ! mount -t ext4 $DST_ROOT_PARTITION $CLONE
 then
 	echo -e "Mount failure of $DST_ROOT_PARTITION, aborting!\n"
 	exit 0
@@ -381,9 +428,9 @@ then
 fi
 
 echo "=> Mounting $DST_BOOT_PARTITION on $CLONE/boot"
-if ! mount $DST_BOOT_PARTITION $CLONE/boot
+if ! mount -t vfat $DST_BOOT_PARTITION $CLONE/boot
 then
-	umount $CLONE
+	umount -t ext4 $CLONE
 	echo -e "Mount failure of $DST_BOOT_PARTITION, aborting!\n"
 	exit 0
 fi
@@ -476,14 +523,16 @@ echo ""
 # Eg. modify $CLONE/etc/hostname, $CLONE/etc/network/interfaces, etc
 # if I'm cloning into a card to be installed on another Pi.
 #
-echo -n "Hit Enter when ready to unmount the /dev/$DST_DISK partitions..."
-read resp
-
+if [ "$QUITE_FOR_CRON" != "true" ]
+then
+	echo -n "Hit Enter when ready to unmount the /dev/$DST_DISK partitions..."
+	read resp
+fi
 echo "unmounting $CLONE/boot"
-umount $CLONE/boot
+umount -t vfat $CLONE/boot
 
 echo "unmounting $CLONE"
-umount $CLONE
+umount -t ext4 $CLONE
 
 
 echo "==============================="