Add remote-backup.sh. Minor fixes

scripts/card-backup.sh

@@ -51,20 +51,20 @@ sudo sh -c "echo 1000 > /sys/class/leds/led0/delay_on"
 
 # Wait for a card reader or a camera
 CARD_READER=$(ls /dev/* | grep $CARD_DEV | cut -d"/" -f3)
-until [ ! -z $CARD_READER ]
+until [ ! -z "$CARD_READER" ]
   do
   sleep 1
   CARD_READER=$(ls /dev/sd* | grep $CARD_DEV | cut -d"/" -f3)
 done
 
 # If the card reader is detected, mount it and obtain its UUID
-if [ ! -z $CARD_READER ]; then
+if [ ! -z "$CARD_READER" ]; then
   mount /dev/$CARD_DEV $CARD_MOUNT_POINT
   # # Set the ACT LED to blink at 500ms to indicate that the card has been mounted
   sudo sh -c "echo 500 > /sys/class/leds/led0/delay_on"
 
   # Create  a .id random identifier file if doesn't exist
-  cd $CARD_MOUNT_POINT
+  cd "$CARD_MOUNT_POINT"
   if [ ! -f *.id ]; then
     random=$(echo $RANDOM)
     touch $(date -d "today" +"%Y%m%d%H%M")-$random.id
@@ -77,7 +77,7 @@ if [ ! -z $CARD_READER ]; then
   BACKUP_PATH=$STORAGE_MOUNT_POINT/"$ID"
   
   # Perform backup using rsync
-  rsync -ah --exclude "*.id" $CARD_MOUNT_POINT/ $BACKUP_PATH
+  rsync -ah --exclude "*.id" "$CARD_MOUNT_POINT"/ "$BACKUP_PATH"
 
   # Turn off the ACT LED to indicate that the backup is completed
   sudo sh -c "echo 0 > /sys/class/leds/led0/brightness"