There's no way you can open the backup with Explorer or using iTunes, only with third-party backup browsers. iMazing is good (at least I didn't have any issues with it...
iTunes libraries are actually a listing of song files. The songs are normal archives somewhere on your computer. You can seek out the location of these files, and later upload...
Unfortunately, it's usually the public sewer that's backed up after a heavy rain, and you have to wait until it starts functioning properly again. However, you can install one-way backwater...
Click the Unlink OneDrive option on the Settings tab, click OK, and close the OneDrive window when it prompts you to reconnect. To complete removal, go to Control Panel >...