Squashed commit of the following:

commit a2c130b657
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 19:15:43 2018 +0100

    Minor tweak

commit 257a327656
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 19:09:24 2018 +0100

    Fix -ext

commit b2e5b1ceec
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 15:28:24 2018 +0100

    Update README.md

commit 5e35563156
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 15:03:04 2018 +0100

    Comment options. Shutdown time as variable

commit 36386b00d8
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 14:58:12 2018 +0100

    Add geotagging

commit 59390b24ee
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 14:55:41 2018 +0100

    Delete config.cfg

commit 59fa6d0ced
Author: Dmitri Popov <dmpop@linux.com>
Date:   Tue Jan 30 14:51:11 2018 +0100

    Update config.cfg

commit 04feb7c260
Author: Dmitri Popov <dmpop@linux.com>
Date:   Mon Jan 29 15:45:55 2018 +0100

    Remove mount share. Add config

commit 1d84ece06b
Author: Dmitri Popov <dmpop@linux.com>
Date:   Mon Jan 29 15:43:58 2018 +0100

    Create config.cfg

commit 47ad5850cc
Author: Dmitri Popov <dmpop@linux.com>
Date:   Fri Jan 26 15:18:21 2018 +0100

    Replace NFS with SHARE

commit 1c2259d7e6
Author: Dmitri Popov <dmpop@linux.com>
Date:   Fri Jan 26 14:38:31 2018 +0100

    Add NFS mount and backup

commit e37bc58168
Author: Dmitri Popov <dmpop@linux.com>
Date:   Fri Jan 26 13:20:17 2018 +0100

    Add inactivity shutdown

commit d759ac4e59
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 18:22:09 2018 +0100

    Fix card id 🐒

commit c0ede01f95
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 18:04:41 2018 +0100

    Exclude id file from backup 🐒

commit e1c6695d21
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 17:54:48 2018 +0100

    Fix card id 🐒

commit a0edc912ce
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 17:52:31 2018 +0100

    Fix card id 🐒

commit 4d9832c47b
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 17:41:43 2018 +0100

    Fix card id 🐒

commit 3bf32c33fb
Author: Dmitri Popov <dmpop@linux.com>
Date:   Sat Jan 13 17:22:38 2018 +0100

    Date/time as card id 🐒

commit acd75a2e6b
Author: Dmitri Popov <dmpop@linux.com>
Date:   Mon Jan 8 19:00:34 2018 +0100

    Add else to handle existing .id file 🐒

commit e409e19bc8
Author: Dmitri Popov <dmpop@linux.com>
Date:   Mon Jan 8 18:46:38 2018 +0100

    Improve card ID handling 🐒

README.md

@@ -30,7 +30,7 @@ Save the changes.
 2. Plug in the backup storage device (or camera, if you configured Little Backup Box as described above)
 3. Plug in the card reader and wait till the Raspberry Pi shuts down
 
-**Note:** To differentiate between different storage cards, the backup script assigns a random 8-digit identifying number to each card (this number is stored in the *CARD_ID* file in the root of the card). The contents of the card is saved on the storage device in a folder with the identifying number as its name.
+**Note:** To differentiate between different storage cards, the backup script creates a datetime-based *.id* file in the root of each storage card. The name of the *.id* file is also used as the destination backup folder on the storage device.
 
 ## Problems?
 

backup.sh

@@ -5,14 +5,31 @@
 # to install the required packages and configure the system.
 
 # Specify devices and their mount points
-STORAGE_DEV="sda1"
+# and other settings
-STORAGE_MOUNT_POINT="/media/storage"
+STORAGE_DEV="sda1" # Name of the storage device
-CARD_DEV="sdb1"
+STORAGE_MOUNT_POINT="/media/storage" # Mount point of the storage device
-CARD_MOUNT_POINT="/media/card"
+CARD_DEV="sdb1" # Name of the storage card
+CARD_MOUNT_POINT="/media/card" # Mount point of the storage card
+GEO_REF="GEOREF.JPG" # Name of the reference photo to be used for geotagging
+SHUTD="5" # Minutes to wait before shutdown due to inactivity
+
+# If there is a wpa_supplicant.conf file in the root of the storage device
+# Rename the original config file,
+# move wpa_supplicant.conf from the card to /etc/wpa_supplicant/
+# Reboot to enable networking
+if [ -f "$STORAGE_MOUNT_POINT/wpa_supplicant.conf" ]; then
+    sudo sh -c "echo 100 > /sys/class/leds/led0/delay_on"
+    mv /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf.bak
+    mv "$STORAGE_MOUNT_POINT/wpa_supplicant.conf" /etc/wpa_supplicant/wpa_supplicant.conf
+    reboot
+fi
 
 # Set the ACT LED to heartbeat
 sudo sh -c "echo heartbeat > /sys/class/leds/led0/trigger"
 
+# Shutdown after a specified period of time (in minutes) if no device is connected.
+sudo shutdown -h $SHUTD "Shutdown is activated. To cancel: sudo shutdown -c"
+
 # Wait for a USB storage device (e.g., a USB flash drive)
 STORAGE=$(ls /dev/* | grep $STORAGE_DEV | cut -d"/" -f3)
 while [ -z ${STORAGE} ]
@@ -24,21 +41,13 @@ done
 # When the USB storage device is detected, mount it
 mount /dev/$STORAGE_DEV $STORAGE_MOUNT_POINT
 
+# Cancel shutdown
+sudo shutdown -c
+
 # Set the ACT LED to blink at 1000ms to indicate that the storage device has been mounted
 sudo sh -c "echo timer > /sys/class/leds/led0/trigger"
 sudo sh -c "echo 1000 > /sys/class/leds/led0/delay_on"
 
-# If there is a wpa_supplicant.conf file in the root of the storage device
-# Rename the original config file,
-# move wpa_supplicant.conf from the card to /etc/wpa_supplicant/
-# Reboot to enable networking
-if [ -f "$STORAGE_MOUNT_POINT/wpa_supplicant.conf" ]; then
-    sudo sh -c "echo 100 > /sys/class/leds/led0/delay_on"
-    mv /etc/wpa_supplicant/wpa_supplicant.conf /etc/wpa_supplicant/wpa_supplicant.conf.bak
-    mv "$STORAGE_MOUNT_POINT/wpa_supplicant.conf" /etc/wpa_supplicant/wpa_supplicant.conf
-    reboot
-fi
-
 # Wait for a card reader or a camera
 CARD_READER=$(ls /dev/* | grep $CARD_DEV | cut -d"/" -f3)
 until [ ! -z $CARD_READER ]
@@ -52,21 +61,30 @@ 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 the CARD_ID file containing a random 8-digit identifier if doesn't exist
+  # Create  a .id random identifier file if doesn't exist
-  if [ ! -f $CARD_MOUNT_POINT/CARD_ID ]; then
+  cd $CARD_MOUNT_POINT
-    < /dev/urandom tr -cd 0-9 | head -c 8 > $CARD_MOUNT_POINT/CARD_ID
+  if [ ! -f *.id ]; then
+    touch $(date -d "today" +"%Y%m%d%H%M").id
   fi
+  ID_FILE=$(ls *.id)
+  ID="${ID_FILE%.*}"
+  cd
+
+# Set the backup path
+BACKUP_PATH=$STORAGE_MOUNT_POINT/"$ID"
 
 # Log the output of the lsblk command for troubleshooting
 sudo lsblk > lsblk.log
   
-# Read the 8-digit identifier number from the CARD_ID file on the card
-# and use it as a directory name in the backup path
-read -r ID < $CARD_MOUNT_POINT/CARD_ID
-BACKUP_PATH=$STORAGE_MOUNT_POINT/"$ID"
-  
 # Perform backup using rsync
-rsync -avh $CARD_MOUNT_POINT/ $BACKUP_PATH
+rsync -av --exclude "*.id" $CARD_MOUNT_POINT/ $BACKUP_PATH
+
+# Geotag photos if the reference photo exists
+if [ -f "$STORAGE_MOUNT_POINT/$GEO_REF" ]; then
+  cd $STORAGE_MOUNT_POINT
+  exiftool −overwrite_original_in_place -r -ext jpg -tagsFromFile $GEO_REF -gps:all .
+fi
+
 # Turn off the ACT LED to indicate that the backup is completed
 sudo sh -c "echo 0 > /sys/class/leds/led0/brightness"
 fi