Are contacts, music, apps safe during iOS update?

[Woodny]

I know that I should do a back-up when I update my iOS software, but I want to be sure if my contacts, music, apps won't be deleted. Can someone say something about this?

 

[Weaselboy]

Like you said, you should backup just to be safe... but no, a normal iOS update will not delete any of your data.

 

[Bear]

I know that I should do a back-up when I update my iOS software, but I want to be sure if my contacts, music, apps won't be deleted. Can someone say something about this?

Regular backups are good. And I had no issues with contacts, music, apps, etc with updates.