Can you try with the latest beta ?
And then, remove onandroid tools + restart app + install onandroid.
(you can install beta from Setting, last item)
did what you told me and now the backup is finishing correct...
After applying a theme in substratum app for 'Android-System' the system reboots and stuck at bootlogo. Tried it with different themes (PitchBlack, Swift Dark...). After flashing substratum rescue file the system boots up.
I enjoy your work every day!
a little donation for your fine work.