xbiancopy never stop

[qoop]

OK. I changed/switch SD cards, Rpi4 v1.2 (8GB, 4GB), Rpi v1.1 (4GB)
I still don't know why I cannot make backup,

I am doing a simple install, following these steps

1. Flashing with "XBian_2020.12.04_rpi4.img" (downloaded on dec 8th)
2. First time boot (to expand filesystem). Change xbian password. Add ~/.ssh/authorized_keys
3. Reboot
4. Change interface language, change keyboard layout and input to "french".
5. Activate "preference/advance mode" (to forgot backup alerts)
6. Make backup to /media/usb0/xbian.img (from Kodi/Xbian or xbian-config), on different USB sticks

Code:

Error during copying data occoured (87)

I could only make my backup from an already one year old installed xbian (with various apt install/update/upgrade)...