Q: I did backup in iTunes and look for 6 hours to finish backup.What do if backup is not done

Hey Dragos11,

Welcome to Apple Support Communities.

It sounds like there's an issue creating a backup of your iOS device in iTunes on your PC. If you haven't already, try taking a look at the article below and running through the troubleshooting tips that it provides. 

If you can't make an iTunes backup of your iPhone, iPad, or iPod touch - Apple Support

Take care.