TWRP (greatslon mod) Backup Error

[sinf1x]

I’m getting “CreateTarFork() process ended with ERROR: 255 Backup Failed” on my BTV-W09 using the greatslon TWRP US version while doing a backup. I’ve tried internal storage and external SD card. Haven’t tried an external USB drive yet though. Flashing SuperSU worked fine with this TWRP, I did get the error about the 3rd modem but this may be because this is a Wi-Fi only device? I’m going to try it again and then try pulling the recovery.log to see if this gives some indication of the failure. Is anyone else receiving this error?

 

[johje]

I received this error last night in my data section as I was creating a nandroid backup in my preparation to install the xposed framework. I was backing up to the external SD card and what fixed it for me was to delete the existing TWRP directory and make sure compression was not checked. After that the backup completed successfully. I did receive the 3rd modem error, but like you, I believe that is due to not having a cellular modem (WiFi only). I also received an "unable to unmount system" error at the very end, but I don't think that is any cause for concern.

 

[sinf1x]

Thanks for the feedback johe. I checked the recovery logs and the backup was failing on different files each time on the data partition. So I added a larger SD Card and the backups work now. So turns out it was just a space issue. The backups take a lot more space than what I thought originally, presumably for caching.