I have iPhone 11 and its screen was broken, so I will send it to an authorized reseller for Apple. but before doing so I will remove all the data I have these data include; photos, videos, apps (mail app, WhatsApp, and other apps).
so I have these 2 questions:-
Is there a way to backup all my data and apps and to be able to restore them after getting my mobile fixed?
How I can securely remove the data inside my phone, so it can not be recovered when I send it to the technician?