Default [Q] Backup TWRP not working

Dear all,

I am currently trying to backup my LG G2 d802 with TWRP.

I used the TWRP manager and I root my device.
I opened the apps and click on backup. The device start to reboot but it stay with the android bot (see attached).
I tried several time but I don't know what to do as my knowledge on android is a bit limited. I also tried with GooManager when starting in recovery mod.

Is one of you have an idea?

Thanks

GB
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