backup and safely wipe phone

Hi,
My Galaxy S8 has a malfunctioning front camera. I have the option to get a new phone, when I send my current one back.

Before I do the exchange, I want do a backup, and what's more important for me, safely wipe the content of the current phone.

How to do this? I have no root, just the plain Vodafone rom without any modifications.

When necessary I can connect the phone to a Linux or OSX machine, I don't own any Windows devices.

Regards,
bashman

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