Should I Store my files on the main hard drive or an external drive
I'm planning on throwing my 2019 Mac Pro away and replacing it with a new Mac Studio. But before doing this, I'm starting to question the way I'm doing things. Currently, I have all of my personal files on the Mac Pro's main boot drive. The reason I've always done this, is because when I make back ups with Time Machine or other methods, I could completely re-create my entire system on one Drive.
Part of my reason for considering to keep my files on an external drive is that if my new Mac ever needed servicing. I could simply unplug the external drive(s) thereby removing all of my personal information, allowing the computer to be serviced.
What are the best practice methods for storing documents and files that I have created?