Hi @Cecilia-31, welcome to our forum!
Your question has been translated to English as this is an English only forum.
I'm not quite sure that I understand exactly what you are asking, could you please elaborate a bit?
If you can't unlock the device or boot the device up, try and perform a software repair using Xperia Companion.
This will delete all data stored on the internal storage of the device and If you can't unlock it or start it, you will not be able to create a backup.
I hope that helps and I'm sorry if I misunderstood your question!
