I also posted a way to repartition the device, maybe it is helpful for you:
https://www.mobileread.com/forums/sho...6&postcount=46
Resizing and reflashing the 2p9 partition as I did is not necessary unless you want to directly restore app data. Otherwise, it is enough to create an empty one. The reader will populate it with default data on next boot.
Also I wont use cp -a but tar -cvf and -xvf for backup / restore as it will preserve symbolic links.
BUT: TAKE CARE. DOUBLECHECK EVERYTHING. SERIOUSLY. YOU CAN BRICK THE T1 WITHOUT ANY CHANCE FOR RECOVERY IF YOU MAKE A MISTAKE LIKE OVERWRITING THE BOOT BLOCK.... someone in the forums already did....