Installing Linux without data loss?

Question

linux

At the moment, I use win, on which there is almost 1t.b of the information I need. Goal: Install Linux Mint without touching the hard drive.
I found several articles on this subject, but everything is described superficially.
For example, I got to this point:
(the screen is not mine)
Alas, I don’t understand what to do in this window. Everything is simply written in the articles, but in practice it is not very clear, and there is no desire to take risks.
Guys, help))
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Krch. just uploaded the necessary files to the server...

Answer 1

Buy a second drive, install Linux on it.

Answer 2

Disconnect physically the disks with the information you need. Install Axis, connect disks reversed