TWRP for MI9T

Thats fine with me, we can continue in english or german, your choice.
I will activate my POCO F1 again and keep the Mi9T for testing until the problem is solved.

Mornig Gents,
Tried new recovery, still the same. Here are the steps i did after backup failure:
Format data in TWRP
Reboot to TWRP
Copied latest ROM Xiaomi.eu to internal storage
wiped cache and davlik
backup Data, failed
Booted into System
installed basics MIUI
booted back into TWRP
Tried backup of data, failed again
Boot into system, that is the actual state
Logs are attached

I am prepared for the next steps

Same issue as ever.
flashed trwp
reboot into twrp
data backup failed
format data in twrp
reboot into twrp and saved logfile recovery_wipedata.log
installed ROM
reboot to system everything ok
reboot to twrp
Data backup failed
created logfile recovery_dataBackup.log

Logs are attached
What are the next steps ?

does not boot into menu, stuck on Logo

It boots into the Menu, but data backup still not possible.