I tried to back up to external OTG storage.
I tried to back up to external OTG storage.
I have no experience with OTG backup, sorry. But error 255 means low storage space, so check how much space is left there. If the card is empty and still doesn't have enough space to back everything up, try backing up fewer files, copying them to pc, then erasing the card and backing up other files, until you have backed up everything.
Thank you.
gpg --keyring ./gpgkey-8DFF53E18F2ABC8D8F3C92237EE0FC4DCC014E3D.gpg --verify recovery.img.asc