Backup kindle books (from the kindle itself). For use in cron.

backup.sh

#!/bin/sh

SSID="YOUR WIRELESS SSID"
REMOTE_LOCATION="rsync://SERVER/module"

# wake up. Not sure if this is neccessary            
# will error if already awake           
lipc-set-prop com.lab126.powerd wakeUp 1
                
# start wireless                             
lipc-set-prop com.lab126.cmd wirelessEnable 1
                                                                  
# check if the kindle is connected to the correct wireless network
if iwconfig wlan0 | grep -q "ESSID:\"$SSID\""
then                   
  # send the books over                
  # NOTE: does not delete removed books           
  rsync -q -a /mnt/us/documents "$REMOTE_LOCATION"
fi
                  
# go back to sleep                                              
# again, not sure if necessary                                  
lipc-send-event com.lab126.powerd.debug dbg_power_button_pressed

Turns out the kindle sleeps deeper than I thought. Going to move it to trigger when the power button gets pressed.