Hi bigbiff,
I have now carried out "Restore Defaults". Then a backup on SD-EXT started. This backup shows me in TWRP also that it was successful. But after a reboot, I can not find any backup data again. I have now been looking for a log. This log is now under /cache/recovery "last_log".
After I have now a backup executed on the internal memory. This backup has worked and it can be found the backup data in the internal memory.
So only the backup to external-SD does not seem to work.
Do you need the "last_log" again?
Thanks and Regards