I'm trying to help my niece and need your help please.

If you're familiar with "Password Safe and Manager" (icon below), do you know whether it stores its data in an iTunes backup?

iPhone is completely destroyed, and she will recover onto a new device soonest but she's nervous wether the last iTunes (i.e. cabled) backup contains the passwords from this app.

Any idea?

I can't find any Apple doc which indicates how to see CONTENT of a backup (not just the numbered files comprising the backup)