Protecting your Raspberry Pi from power failure - Raspberry Pi UPS

https://domoticproject.com/protect-raspberry-pi-ups-power-failure/ 

Read only roots safer https://github.com/JasperE84/root-ro 

https://www.raspberrypi.org/blog/adafruits-read-only/ 

http://www.sfo-takumi.com/shop/ 

https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=161416