TWRP - Backup successfully, but with errors in the log

[boromyr]

Hi, it's the first time I use TWRP to make a backup of the rom before changing it, the backup was done correctly but I get red errors in the log file.

TWRP 3.3.1 unofficial Zenfone 5 ZE620KL
I start the system backup, selecting everything except the section: "Data (archive excluded) 0MB" (fails if selected), the backup proceeds correctly to the end, but during the backup many words "Unable to mount '/ are printed in the log" given 'invalid argument', even though you have not selected that empty partition. Is this error normal to occur, and above all there is a risk that the backup is not restorable for this error?
I don't know if it's safe to try to format that partition even if it's empty.


Thanks for the tips.

 

[alecxs]

0 MB usually indicates userdata partition is not mounted, therefore one can't create backup. common reason is encryption.

but without recovery.log it's all guesswork, share your logs to get help

 

[xXx yYy]

IMO the backup cannot have been successful, otherwise you would not have received the numerous error messages.

 

[boromyr]

Questi sono i miei file di registro, con e senza la cartella Data selezionata.

Aggiungo anche che ho i permessi di root, e ho disabilitato qualsiasi tipo di sblocco schermo e pin, esclusa la SIM ma non credo che possa creare problemi alla SIM.

MOD Edit:
These are my log files, with and without the Data folder selected. I also add that I have root permissions, and I have disabled any type of screen and pin unlock, excluding the SIM but I do not think it can create problems for the SIM.

 

[alecxs]

I have disabled any type of screen and pin unlock

this could be the culprit. usually TWRP will ask for pattern to decrypt Data.

maybe set screen lock and try this?
https://blog.alxu.ca/unlocking-large-pattern-encryption-in-twrp.html

 

[boromyr]

But is this partition the internal partition accessible to the user, where photos, music downloads, etc. are located

I'm interested to know if this partition is needed for ROM recovery, because for apps I have backups with Migrate and Titanium Backup, and photos I have in my pc, so if it's not needed for ROM recovery I could also format it to make it accessible, it seems to be the only 100% working way according to the community.

However, in the meantime I switched to OrangeFox as recovery, which supports my device officially and is more up to date.

 

[alecxs]

userdata partition is the only* writeable partition at all, everything else is read-only. that's why it is called ROM (read-only memory)

if you don't care about factory reset, of course you can just format it to remove encryption.

*let's ignore cache misc fota etc for internal use only

 

[boromyr]

So the data partition is not needed to restore Android OS?

Obviously, before formatting it, I will copy my photos and documents to the external memory.

 

[alecxs]

not needed

 

[boromyr]

Thank you.