Hello there @giuseppecristiano123, I'm sorry to hear you had trouble with this!
To remove the backup folder or subfolders, you would need to disable the computer backup feature first.
You can check out the steps to do this at the bottom of this article.
If you're still having any problems with this, then please don't hesitate to give me a nudge here. I'd be happy to help out.
Hope this info helps!