Pi13 upgrade from Jessie 8 to Stretch 9 - performed 15/12/20
History
Upgraded my raspberry pi 13, which I think had a minimal install Raspbian, Debian i.e. has no desktop installed. The Pi had a PiFaceIO board installed, refer to my previous HPR episode Hpr2901
Backup process, in case something went wrong
I first moved all the unnecessary...