Help What is the best way to make a back up from the entire Smartphone?

[Biffos]

here is an unrooting guide:
https://www.android1pro.com/unroot-sony-xperia/

Many thanks. Does not look that easy.

does your pc detect your phone when you connect the phone to the pc?

Yes, after plugging it in Xperia Companion automatically starts (and shows the messages, no access, etc.). And it shows the message that the phone is blocked, so I have to touch the option then on the phone to make transfer possible and the message the phone is blocked disappears.